[en] The aim of the present study was to estimate the effect of dystocia on lactation performance, using an incomplete gamma function. Data from March 2000 to April 2009 comprising 100,628 lactations of 65,421 cows in 204 dairy herds collected by the Animal Breeding Center of Iran were used. Of 100,628 births, 91.8% required no assistance, whereas 8.2% required assistance of some sort. Factors associated with the presence of dystocia were calving season, calving year, herd, calf sex, parity, and age of dam. Peak yield for primiparous cows with dystocia at calving occurred on d 87.2 [standard error (SE) 0.47], and for primiparous cows with easy calving, the peak of lactation was on d 83.3 (0.25). Peak yield was lowered by 0.39 (SE 0.07), 2.20 (SE 0.15), 2.22 (SE 0.21), and 2.54 (SE 0.32) kg for cows with incidence of dystocia compared with normal cows in parity 1 to 4, respectively. Dystocia was associated with decreased 305-d lactation performance in all parities, mostly in early lactation. Although more difficult births occurred in heifer calvings, loss in lactation performance was greater in second or later lactations following a difficult birth.
Disciplines :
Veterinary medicine & animal health
Author, co-author :
Atashi, Hadi ; Université de Liège - ULiège > Département GxABT > Animal Sciences (AS) ; Department of Animal Science, Shiraz University, Shiraz, Iran. Atashi@shirazu.ac.ir
Abdolmohammadi, A R; Department of Animal Science, Razi University, 67156-85438 Kermanshah, Iran
Asaadi, A; School of Veterinary Science, Shiraz University, 71345-1731 Shiraz, Iran
Akhlaghi, A; Department of Animal Science, Shiraz University, 71441-65186 Shiraz, Iran
Dadpasand, M; Department of Animal Science, Shiraz University, 71441-65186 Shiraz, Iran
Ahangari, Y Jafari
Language :
English
Title :
Using an incomplete gamma function to quantify the effect of dystocia on the lactation performance of Holstein dairy cows in Iran.
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