[en] This study investigates the impact of heat stress, measured by
daily temperature-humidity index (THI), on the reproductive
performance of native Algerian cows. We analysed fertility
metrics from 3,847 artificial inseminations performed on 2,130
Atlas Brown cows. Results showed a total pregnancy rate (TPR)
of 58.97%, a first-service conception rate (CR1stAI) of 24.41%,
and a second-service conception rate (CR2ndAI) of 36.71%.
Severe THI levels (>80) significantly decreased TPR by 26% and
CR1stAI by 46%, but low and moderate THI had no significant
impact. Heat stress did not significantly affect CR2ndAI and
repeat breeding cows (RBC), though moderate and severe heat
stress decreased CR2ndAI, and severe heat stress increased RBC.
Moderate heat stress reduced the proportion of cattle with <30
days reproductive period. The study shows that Atlas Brown
cattle are susceptible to high THI levels and perform well
under low and moderate heat stress, suggesting the potential
utility of indigenous breeds in high-THI regions
Research Center/Unit :
Laboratory of Life Sciences and Techniques (STIV), University of Souk-Ahras, Souk-Ahras, Algeria
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Ferag, Aziza ; University of Souk-Ahras ; University of Souk-Ahras
Gherissi, Djalel Eddine ; University of Souk-Ahras ; University of Souk-Ahras institution
Khenenou, Tarek; University of Souk-Ahras ; University of Souk-Ahras
Boughanem, Amel; National Centre for Artificial Insemination and Genetic Improvement (CNIAAG)
Moussa, Hafida Hadj; National Centre for Artificial Insemination and Genetic Improvement (CNIAAG)
Maamour, Amina; University of Souk-Ahras
Hanzen, Christian ; Université de Liège - ULiège > Département d'Enseignement et de Clinique des animaux de Production (DCP) ; Faculté de médecine vétérinaire
Language :
English
Title :
Fertility of indigenous “Atlas Brown” Algerian cattle under different heat stress levels
Dechambre, P., 1922, Treatise on Zootechnics. Volume III. Cattle. Ch. Amat-Asselin and Houzeau, Paris. In: N.R., Joschi, E.A., Mc Laughlin and R.W., Phillips (Eds.) African Cattle: Types and Breeds (Rome, Etudes Agricoles No. 37: FAO), p. 317.
Bouzebda-Afri, F., Bouzebda, Z., Bairi, A., and Franck, M., 2007, Etude des performances boucheres dans la population bovine locale dans l’est Algérien. Sciences & Technologie. C, Biotechnologies26, 89–97. https://Revue.Umc.Edu.Dz/C/Article/View/381
Bousbia, A., Boudalia, S., Gueroui, Y., Hadded, K., Bouzaoui, A., Kiboub, D., and Symeon, G., 2021, Use of multivariate analysis as a tool in the morphological characterization of the main indigenous bovine ecotypes in Northeastern Algeria. PLOS ONE16(7), e0255153. doi: 10.1371/journal.pone.0255153
Rahal, O., Aissaoui, C., Elmokhefi, M., Sahraoui, H., Ciani, E., and Gaouar, S.B.S., 2017, A comprehensive characterization of Guelmoise, a Native cattle breed from Eastern Algeria. Genetics & Biodiversity Journal1(1), 31–42. doi: 10.46325/gabj.v1i1.83
Boushaba, N., Boujenane, I., Moazami-Goudarzi, K., Flori, L., Saïdi-Mehtar, N., Tabet-Aoul, N., and Laloë, D., 2019, Genetic diversity and relationships among six local cattle populations in semi-arid areas assessed by a bovine medium-density single nucleotide polymorphism data. Animal13(1), 8–14. doi: 10.1017/S1751731118001179
Kali, S., Benidir, M., Ait Kaci, K., Belkheir, B., and Benyoucef, M.T., 2011, Situation de la filière lait en Algérie: Approche analytique d’amont en aval. Livestock Research for Rural Development23, http://www.lrrd.org/lrrd23/8/Kali23179.htm
Mohamed-Brahmi, A., Tsiokos, D., Ben Saïd, S., Boudalia, S., Smeti, S., Bousbia, A., Gueroui, Y., Boudebbouz, A., Anastasiadou, M., and Symeon, G.K., 2022, Challenges and opportunities of the Mediterranean indigenous bovine populations: Analysis of the different production systems in Algeria, Greece, and Tunisia. Sustainability14(6), 3356. doi: 10.3390/su14063356
Ferag, A., Gherissi, D.E., Bordja, N., Boughanem, A., Hadj Moussa, H., and Khenenou, T., 2023, Monitoring of reproduction activity on Algerian dairy cattle farms. Folia veterinaria67(4), 67–78. https://sciendo.com/article/10.2478/fv-2023-0040
Zeroual, A., Assani, A.A., Meddi, M., and Alkama, R., 2019, Assessment of climate change in Algeria from 1951 to 2098 using the Köppen–Geiger climate classification scheme. Climate Dynamics52(1–2), 227–243. doi: 10.1007/s00382-018-4128-0
Yerou, H., Zoghlami, M., Madani, T., Benamara, N., and Rehal, M., 2021, Impact de l’indice température-humidité sur les paramètres de reproduction de vaches Holsteins en zone semi-aride de l’Ouest algérien. Livestock Research for Rural Development3310, http://www.lrrd.org/lrrd33/10/33123houa.html
Hanzen, C., Delhez, P., Hornick, J.-L., Lessire, F., and Gherissi, D.E., 2024, Le stress thermique environnemental dans l’espèce bovine: 2. effets physiologiques, pathologiques, comportementaux, alimentaires, immunitaires et sur la production laitière. Revue d’élevage et de médecine vétérinaire des pays tropicaux77, 1–13. doi: 10.19182/remvt.37380
Chacha, F., Gherissi, D.E., Lamraoui, R., Bouzebda-Afri, F., and Bouzebda, Z., 2022, Evaluation of body condition, daily milk production and some biochemical parameters during the postpartum period according to the calving season in Montbeliard dairy cows reared in the semi-arid region, Algeria. Veterinarska Stanica53(6), 677–687. doi: 10.46419/vs.53.6.3
Kambal, S., Tijjani, A., Ibrahim, S.A.E., Ahmed, M.A., Mwacharo, J.M., and Hanotte, O., 2023, Candidate signatures of positive selection for environmental adaptation in indigenous African cattle: A review. Animal Genetics54(6), 689–708. doi: 10.1111/age.13353
Gherissi, D.E., Chacha, F., Lamraoui, R., Messaadia, F., Nouadri, S.E., Bouzebda Afri, F., and Bouzebda, Z., 2022, Seasonal trends and milking-related factors influencing somatic cell counts in tank milks of dairy cattle in northeast Algeria. Pakistan Journal of Agricultural Sciences59(4), 531–542. doi: 10.21162/PAKJAS/22.94
Kechroud, A.A., Merdaci, L., Miroud, K., and Gherissi, D.E., 2023, Herd-level risk factors for lameness, leg injuries, thin body condition and mastitis on Algerian dairy farms. Folia veterinaria67(2), 62–77. doi: 10.2478/fv-2023-0018
Sammad, A., Umer, S., Shi, R., Zhu, H., Zhao, X., and Wang, Y., 2020, Dairy cow reproduction under the influence of heat stress. Journal of Animal Physiology and Animal Nutrition104(4), 978–986. doi: 10.1111/jpn.13257
Leliveld, L.M., Lovarelli, D., Finzi, A., Riva, E., and Provolo, G., 2023, Effects of cow reproductive status, parity and lactation stage on behaviour and heavy breathing indications of a commercial accelerometer during hot weather conditions. International Journal of Biometeorology67(7), 1263–1272. doi: 10.1007/s00484-023-02496-2
Hanzen, C., Delhez, P., Lessire, F., Hornick, J.-L., and Gherissi, D.E., 2025, Le stress thermique environnemental dans l’espèce bovine: 3. Effets sur la reproduction. Revue d’élevage et de médecine vétérinaire des pays tropicaux781–1510.19182/remvt.37381
Nanas, I., Chouzouris, T.-M., Dovolou, E., Dadouli, K., Stamperna, K., Kateri, I., Barbagianni, M., and Amiridis, G.S., 2021, Early embryo losses, progesterone and pregnancy associated glycoproteins levels during summer heat stress in dairy cows. Journal of Thermal Biology98, 102951. doi: 10.1016/j.jtherbio.2021.102951
Alves, J.R.A., de Andrade, T.A.A., de Medeiros Assis, D., Gurjão, T.A., de Melo, L.R.B., and de Souza, B.B., 2020, Productive and reproductive performance, behavior and physiology of cattle under heat stress conditions. Journal of Animal Behaviour and Biometeorology5(3), 91–96. doi: 10.31893/2318-1265jabb.v5n3p91-96
Khan, I., Mesalam, A., Heo, Y.S., Lee, S.-H., Nabi, G., and Kong, I.-K., 2023, Heat stress as a barrier to successful reproduction and potential alleviation strategies in cattle. Animals13(14), 2359. doi: 10.3390/ani13142359
Kawano, K., Sakaguchi, K., Ninpetch, N., Yanagawa, Y., and Katagiri, S., 2024, Physiological high temperatures alter the amino acid metabolism of bovine early antral follicles. The Journal of Reproduction and Development70(3), 184–191. doi: 10.1262/jrd.2023-096
Kasimanickam, R., and Kasimanickam, V., 2021, Impact of heat stress on embryonic development during first 16 days of gestation in dairy cows. Scientific Reports11(1), 14839. doi: 10.1038/s41598-021-94278-2
de Jesús Mejía-Lastra, A., Avendaño-Reyes, L., Macías-Cruz, U., de Jesús Velázquez-Alcaraz, T., Robinson, P.H., López-Baca, M.Á., Castañeda-Bustos, V.J., Bombal-Catalán, E., Gastélum-Delgado, M.A., Aguilar-Quiñonez, J.A., and Mellado, M., 2024, Cooling Holstein cows for 60 days prepartum in summer: Effects on prepartum physiology, postpartum productivity, and calf growth. International Journal of Biometeorology68(5), 899–908. doi: 10.1007/s00484-024-02635-3
Djelailia, H., Bouraoui, R., Jemmali, B., and Najar, T., 2020, Effects of heat stress on reproductive efficiency in Holstein dairy cattle in the North African arid region. Reproduction in Domestic Animals55(9), 1250–1257. doi: 10.1111/rda.13772
Rodríguez-Godina, I.J., García, J.E., Morales, J.L., Contreras, V., Véliz, F.G., Macías-Cruz, U., Avendaño-Reyes, L., and Mellado, M., 2024, Effect of heat stress during the dry period on milk yield and reproductive performance of Holstein cows. International Journal of Biometeorology68(5), 883–890. doi: 10.1007/s00484-024-02633-5
Bayssa, M., Yigrem, S., Betsha, S., and Tolera, A., 2021, Production, reproduction and some adaptation characteristics of Boran cattle breed under changing climate: A systematic review and meta-analysis. PLOS ONE16(5), e0244836. doi: 10.1371/journal.pone.0244836
Saidane, Z., Dahou, A.A., and Homrani, A., 2022, Description of the zootechnical performance of the indigenous Algerian cattle breeds “Atlas Brown” from the region of El Ouldja in Western Algeria. Acta Manilana70, 93–102. doi: 10.53603/actamanil.70.2022.bvas3388
Titaouine, M., Gherissi, D.E., Chergui, M., and Mohamdi, H., 2023, Influence of region on some reproductive parameters in Ouled Djellal sheep. Jurnal Ilmu Ternak dan Veteriner28(4), 220–226. doi: 10.14334/jitv.v28i4.3211
Liu, Y., Zhao, G., Lin, X., Zhang, J., Hou, G., Zhang, L., Liu, D., Li, Y., Li, J., and Xu, L., 2022, Genomic inbreeding and runs of homozygosity analysis of indigenous cattle populations in Southern China. PLOS ONE17(8), e0271718. doi: 10.1371/journal.pone.0271718
Huang, N., Zhao, L., Wang, J., Jiang, Q., Ju, Z., Wang, X., Yang, C., Gao, Y., Wei, X., Zhang, Y., Xiao, Y., Liu, W., Lu, S., and Huang, J., 2023, Signatures of selection in indigenous Chinese cattle genomes reveal adaptive genes and genetic variations to cold climate. Journal of Animal Science101, skad006. doi: 10.1093/jas/skad006
Bernabucci, U., Biffani, S., Buggiotti, L., Vitali, A., Lacetera, N., and Nardone, A., 2014, The effects of heat stress in Italian Holstein dairy cattle. Journal of Dairy Science97(1), 471–486. doi: 10.3168/jds.2013-6611
Mwai, O., Hanotte, O., Kwon, Y.-J., and Cho, S., 2015, Invited review - African indigenous cattle: Unique genetic resources in a rapidly changing world. Asian-Australasian Journal of Animal Sciences28(7), 911–921. doi: 10.5713/ajas.15.0002R (PMID: 26104394; PMCID: PMC4478499).
FAO, 2019, Indigenous livestock and poultry for alleviating under-nutrition among women and children in rural farm-households of Sri Lanka. FAO, 2019: CA4666EN/1/05.19.
FAO, 2012, FAO animal production and health. Characterization and value addition to local breeds and their products in the near east and north Africa. Regional WorkshopRabat, Morocco19–21November.
FAO, 2007, The state of the world’s animal genetic resources for food and agriculturehttp://www.fao.org/docrep/010/a1250e/a1250e00.htm.
Ben Jemaa, S., Boussaha, M., Ben Mehdi, M., Lee, J.H., and Lee, S.-H., 2015, Genome-wide insights into population structure and genetic history of Tunisian local cattle using the illumina bovinesnp50 beadchip. BMC Genomics16(1), 677. doi: 10.1186/s12864-015-1638-6
Messaoud, L., Kousseila, B., Amel, B., and Sabria, L., 2022, Innovation’s adoption by farmers: Evidence from Mila region of Algeria. Russian Journal of Agricultural & Socio-Economic Sciences doi: 10.18551/rjoas.2022-06.01
Wilson, R.T., 2018, Crossbreeding of cattle in Africa. Journal of Agriculture and Environmental Sciences6(1), 16–31. doi: 10.15640/jaes.v7n1a3
NRC (National Research Council), 1971, A Guide to environmental research on animals (Washington, DC: National Academy of Sciences)).
Collier, R.J., and Collier, J.L., eds 2012, Environmental physiology of livestock1st ed. Wiley. doi: 10.1002/9781119949091
Boďo, Š., Lüttmerding, G., Gálik, R., Kunc, P., Knížková, I., and Gürdil, G.A.K., 2022, Analysis of selected data from robotic milking regarding to heat stress of dairy cows. Acta Technologica Agriculturae25(2), 92–96. doi: 10.2478/ata-2022-0015
NADIS, 2024, National animal diseases information services. https://www.nadis.org.uk/disease-a-z/cattle/managing-heat-stress-in-dairy-cows/
Vitali, A., Segnalini, M., Bertocchi, L., Bernabucci, U., Nardone, A., and Lacetera, N., 2009, Seasonal pattern of mortality and relationships between mortality and temperature-humidity index in dairy cows. Journal of Dairy Science92(8), 3781–3790. doi: 10.3168/jds.2009-2127
Hanzen, C., 2009, Approche épidémiologique de la reproduction bovine. Garbo: un programme de gestion de la reproduction bovine. Consulted online: 2024.
Hanzen, C., Delhez, P., Knapp, E., Hornick, J.-L., and Gherissi, D.E., 2024, Le stress thermique environnemental dans l’espèce bovine: 1. Caractéristiques générales et méthodes d’évaluation. Revue d’élevage et de médecine vétérinaire des pays tropicaux77, 1–8. doi: 10.19182/remvt.37379
Christensen, J.H., Hewitson, B., Busuioc, A., Chen, A., Gao, X., Held, I., Jones, R., Kolli, R.K., Kwon, W.-T., Laprise, R., Magaña Rueda, V., Mearns, L., Menéndez, C.G., Räisänen, J., Rinke, A., Sarr, A., and Whetton, P., 2007, Regional climate projections. In: S., Solomon, Qin, D., Manning, M., Chen, Z., Marquis, M., Averyt, K.B., Tignor, M., and Miller, H.L., Ed. Climate Change: The Physical Science Basis. Contribution of Working Group I to the Fourth Assessment Report of the Intergovernmental Panel on Climate Change (Cambridge & New York: Cambridge University Press), pp. 847–940.
Zeroual, A., Assani, A.A., Meddi, H., Bouabdelli, S., Zeroual, S., and Alkama, R., 2020, Assessment of projected precipitations and temperatures change signals over Algeria based on regional climate Model: RCA4 simulations. A.M., Negm, A., Bouderbala, H., Chenchouni and D., Barceló Eds Water resources in Algeria - Part I. The Handbook of Environmental Chemistry Vol. 97Springer International Publishing) pp. 135–159. doi: 10.1007/698_2020_526
IPCC, 2021, Climate change: The physical science basis. Contribution of working group I to the sixth assessment report of the intergovernmental panel on climate change. V.M., Delmotte, P., Zhai, A., Pirani, S.L., Connors, C., Péan, S., Berger, N., Caud, Y., Chen, L., Goldfarb, M.I., Gomis, M., Huang, K., Leitzell, E., Lonnoy, J.B.R., Matthews, T.K., Maycock, T., Waterfield, O., Yelekçi, R., Yu, and B., Zhou Eds (Cambridge, U.K. & New YorkCambridge University Press) doi: 10.1017/9781009157896
Johnson, J.S., 2018, Heat stress: Impact on livestock well-being and productivity and mitigation strategies to alleviate the negative effects. Animal Production Science58(8), 1404–1413. doi: 10.1071/AN17725
FAO, 2022, Commission on genetic resources for food and agriculture. Available online at: https://openknowledge.fao.org/server/api/core/bitstreams/0f2636fb-2c28-47ce-a749-0db0b6847471/content.
Nedjraoui, D., 2006, Algeria country pasture/forage resource profiles (Rome: FAO), p. 10.
Oliveira, M., Santos, R., Chebel, R., and Demetrio, D., 2020, 10 pregnancy rates following artificial insemination or embryo transfer in lactating Holstein cows. Reproduction, Fertility, and Development32(2), 130. doi: 10.1071/RDv32n2Ab10
Nishimwe, K., Bizimana, J., Manishimwe, R., Ayabagabo, J., Byukusenge, M., Habimana, R., and Bareeba, F., 2015, Factors affecting the pregnancy rate in small scale dairy farms after the artificial insemination in rural area, Rwanda. International Journal of Livestock Research5(3), 19–25. Available online at: http://www.scopemed.org/fulltextpdf.php?mno=173574
Baruselli, P.S., Ferreira, R.M., Vieira, L.M., Souza, A.H., Bó, G.A., and Rodrigues, C.A., 2020, Use of embryo transfer to alleviate infertility caused by heat stress. Theriogenology155, 1–11. doi: 10.1016/j.theriogenology.2020.04.028
Hansen, P.J., 2021, Compromised pregnancy success caused by heat stress. In: R.M., Hopper (Ed.) Bovine reproduction (Hoboken: John Wiley & Sons), pp. 814–829. doi: 10.1002/9781119602484.ch67.
Kirdeci, A., Çetin, H., and Raza, S., 2021, Effect of vitamin C on pregnancy rate and 8-OHdG levels during heat stress in post-partum dairy cattle. Journal of Animal Reproduction and Biotechnology36(4), 194–202. doi: 10.12750/JARB.36.4.194
Singh, S.P., Kumar, A., and Sourya, N., 2021, Effects of heat stress on animal reproduction. International Journal of Fauna and Biological Studies8(2), 16–20. https://www.faunajournal.com/archives/2021/vol8issue2/PartA/8-2-3-478.pdf
El-Wishy, A.B., 2013, Fertility of Holstein cattle in a subtropical climate of Egypt. Iranian Journal of Applied Animal Science3(1), 45–51. https://ijas.rasht.iau.ir/article_514239.html
Rolando, P., N, R., Montenegro, M., and A, L., 2022, Temperature-humidity index and reproductive performance of dairy cattle farms in Lima, Peru. Open Veterinary Journal12(3), 399. doi: 10.5455/OVJ.2022.v12.i3.14
Espinoza-Sandoval, O.R., and Calsamiglia, S., 2023, Modeling the profitability of investing in cooling systems in dairy farms under several intensities of heat stress in the Mediterranean. Journal of Dairy Science106(8), 5485–5500. doi: 10.3168/jds.2022-22816
Ferag, A., Gherissi, D.E., Khenenou, T., Boughanem, A., Moussa, H.H., Kechroud, A.A., and Fares, M.A., 2024, Heat stress effect on fertility of two imported dairy cattle breeds from different Algerian agro-ecological areas. International Journal of Biometeorology68(12), 2515–2529. doi: 10.1007/s00484-024-02761-y
Ferag, A., Gherissi, D.E., Khenenou, T., Boughanem, A., Moussa, H.H., and Maamour, A., 2024, Reproduction efficiency of native and imported Algerian cattle under challenging climatic conditions. Biology and Life Sciences Forum36, 13. doi: 10.3390/blsf2024036013
Gherissi, D.E., Lamraoui, R., Chergui, M., Titaouine, M., Chaid, D., Benamara, S., Chacha, F., and Gaouar, S.B.S., 2024. Slaughter performances, body composition and carcass traits of indigenous Algerian cattle “Brune de l’Atlas”. Veterinarija ir Zootechnika82(2), 38–50.
Kajaysri, J., and Wattananorasate, A., 2018, Influence of heat stress on pregnancy rate of beef cattle heifers and cows using ovsynch plus CIDR followed by timed artificial insemination in Thailand. Thai Journal of Veterinary Medicine48(1), 71–77. doi: 10.56808/2985-1130.2891
Abd-Elhafeez, A.M., Mohamed Said Amin, A., Hussein Ramadan, M., Helal, A., and Yassin Mohamed, M., 2020, The most applicable physical properties of cervical mucus correlated with high pregnancy rate in Egyptian cows under heat stress condition. Advances in Animal & Veterinary Sciences8(s2), 122–131. doi: 10.17582/journal.aavs/2020/8.s2.122.131
Parveen, K., Gupta, A.K., Mumtaz, S., Khan, A.H., and Rathore, A., 2022, Impact of heat stress on reproductive performance of Sahiwal cows. Indian Journal of Dairy Science75(2), 167–172. https://mjl.clarivate.com/search-results
Mouffok, C., Allouni, A., Semara, L., and Belkasmi, F., 2019, Factors affecting the conception rate of artificial insemination in small cattle dairy farms in an Algerian semi-arid area. Livestock Research for Rural Development31(4), 1–9. http://www.lrrd.org/lrrd31/4/mouff31049.html
Eulmi, H., Deghnouche, K., and Gherissi, D.E., 2023, Dairy cattle breeding practices, production and constraints in arid and semi-arid Algerian bioclimatic environments. The International Journal of Environmental Studies81(3), 1238–1255. doi: 10.1080/00207233.2023.2228616
Souames, S., and Berrama, Z., 2020, Factors affecting conception rate after the first artificial insemination in a private dairy cattle farm in North Algeria. Veterinary World13(12), 2608–2611. doi: 10.14202/vetworld.2020.2608-2611
Haou, A., Miroud, K., and Gherissi, D.E., 2021, Impact des caractéristiques du troupeau et des pratiques d’élevage sur les performances de reproduction des vaches laitières dans le Nord-Est algérien, Revue D’élevage et de Médecine Vétérinaire Des Pays Tropicaux74(4), 183–191. doi: 10.19182/remvt.36798
Mamine, F., Fares, M., Duteurtre, G., and Madani, T., 2021, Regulation of the dairy sector in Algeria between food security and development of local production: Review. Revue D’élevage et De Médecine Vétérinaire Des Pays Tropicaux742, 73–81. doi: 10.19182/remvt.36362
El-Sheikh Ali, H., Tamura, Y., Sameshima, H., and Kitahara, G., 2020, Impact of summer heat stress on the thermal environment of bovine female genital tract. Tropical Animal Health and Production52(6), 3449–3455. doi: 10.1007/s11250-020-02378-4
Kawano, K., Yanagawa, Y., Nagano, M., and Katagiri, S., 2022, Effects of heat stress on the endometrial epidermal growth factor profile and fertility in dairy cows. The Journal of Reproduction and Development68(2), 144–151. doi: 10.1262/jrd.2021-120
Penev, T., Dimov, D., Vasilev, N., Mitev, J., Miteva, T., Marinov, I., and Stojnov, M., 2021, Influence of heat stress on reproductive performance in dairy cows and opportunities to reduce its effects-a review. Agricultural Science and Technology13(1), 3–11. doi: 10.15547/ast.2021.01.001
Wachida, N., Dawuda, P., Ate, I.U., and Rekwot, P.I., 2022, Impact of environmental heat stress on ovarian function of zebu cows. Journal of Animal Health and Production10(4), 412–419. doi: 10.17582/journal.jahp/2022/10.4.412.419
Ooi, E., Stevenson, M.A., Goddard, M.E., Beggs, D.S., Mansell, P.D., Pryce, J.E., and Pyman, M.F., 2023, Validating the female fertility estimated breeding value in Australian commercial dairy herds. Journal of Dairy Science106(5), 3376–3396. doi: 10.3168/jds.2022-21955
Morini, G., Tummaruk, P., and Rensis, F.D., 2019, Conception rates following an Ovsynch and fixed-time insemination protocol with progesterone inclusion in cyclic dairy cows during the warm and cold seasons. Veterinarska Stanica50(3), 193–199. http://www.veinst.hr/casopis-veterinarska-stanica/doc_download/362-01-morini-conception-rates-following-an-ovsynch
Kooverjee, B.B., Soma, P., Van Der Nest, M.A., Scholtz, M.M., and Neser, F.W.C., 2022, Selection signatures in South African Nguni and Bonsmara cattle populations reveal genes relating to environmental adaptation. Frontiers in Genetics13, 909012. doi: 10.3389/fgene.2022.909012
Tijjani, A., Salim, B., Da Silva, M.V.B., Eltahir, H.A., Musa, T.H., Marshall, K., Hanotte, O., and Musa, H.H., 2022, Genomic signatures for drylands adaptation at gene-rich regions in African zebu cattle. Genomics114(4), 110423. doi: 10.1016/j.ygeno.2022.110423
Hooper, H.B., Titto, C.G., Gonella-Diaza, A.M., Henrique, F.L., Pulido-Rodríguez, L.F., Longo, A.L.S., Leme-dos-Santos, T.M.D.C., Geraldo, A.C.A.P.D.M., Pereira, A.M.F., Binelli, M., Balieiro, J.C.D.C., and Titto, E.A.L., 2019, Heat loss efficiency and HSPs gene expression of Nellore cows in tropical climate conditions. International Journal of Biometeorology63(11), 1475–1486. doi: 10.1007/s00484-018-1576-5
Akkou, M., Mohamed, B., and Fatiha, S., 2022, Effects of milk yield and quality at post-calving period on Algerian cows’ reproductive performances. Journal of the Hellenic Veterinary Medical Society73(1), 3757–3764. doi: 10.12681/jhvms.25681
Gaafar, H.M.A., Ma, A.E.H., El-Gendy, M.E., Bassiouni, M.I., Halawa, A.A., and Shm, S., 2011, Effect of heat stress on performance of dairy Friesian cows 2-reproductive performance. http://www.sciencepub.net.
Mellado, M., Rodríguez-Godina, I.J., García, J.E., Morales, J.L., Contreras, V., Véliz, F.G., Macías-Cruz, U., and Avendaño-Reyes, L., 2022, Effect of heat stress during the dry period on milk yield and reproductive performance of Holstein cows. SSRN Electronic Journal. https://ssrn.com/abstract=4038062.
Rodríguez-Bermúdez, R., Miranda, M., Baudracco, J., Fouz, R., Pereira, V., and López-Alonso, M., 2019, Breeding for organic dairy farming: What types of cows are needed?The Journal of Dairy Research86(1), 3–12. doi: 10.1017/S0022029919000141
Sørensen, L.P., Pedersen, J., Kargo, M., Nielsen, U.S., Fikse, F., Eriksson, J.Å., Pösö, I., Stephansen, R.S., and Aamand, G.P., 2018, Review of Nordic total merit index full report November 2018. https://www.nordicebv.info/wp-content/uploads/2018/11/2018.11.06-NTM-2018-report-Full.pdf.
Ferrari, V., Visentin, G., Van Kaam, J.B.C.H.M., Penasa, M., Marusi, M., Finocchiaro, R., and Cassandro, M., 2023, Genetic and nongenetic variation of heifer fertility in Italian Holstein cattle. JDS Communications4(1), 35–39. doi: 10.3168/jdsc.2022-0270
Shi, R., Brito, L.F., Liu, A., Luo, H., Chen, Z., Liu, L., Guo, G., Mulder, H., Ducro, B., Van Der Linden, A., and Wang, Y., 2021, Genotype-by-environment interaction in Holstein heifer fertility traits using single-step genomic reaction norm models. BMC Genomics22(1), 193. doi: 10.1186/s12864-021-07496-3
Fathoni, A., Boonkum, W., Chankitisakul, V., and Duangjinda, M., 2022, An appropriate genetic approach for improving reproductive traits in crossbred Thai–Holstein cattle under heat stress conditions. Veterinary Sciences9(4), 163. doi: 10.3390/vetsci9040163
Tadesse, B., Reda, A.A., Kassaw, N.T., and Tadeg, W., 2022, Success rate of artificial insemination, reproductive performance and economic impact of failure of first service insemination: A retrospective study. BMC Veterinary Research18(1), 226. doi: 10.1186/s12917-022-03325-1
Guinn, J.M., Nolan, D.T., Krawczel, P.D., Petersson-Wolfe, C.S., Pighetti, G.M., Stone, A.E., Ward, S.H., Bewley, J.M., and Costa, J.H.C., 2019, Comparing dairy farm milk yield and components, somatic cell score, and reproductive performance among United States regions using summer to winter ratios. Journal of Dairy Science102(12), 11777–11785. doi: 10.3168/jds.2018-16170
