Faecal excretion; Grazing; Indoor; Italian ryegrass; LIPE®; Pearl millet; Animal Science and Zoology; Veterinary (all); General Veterinary
Abstract :
[en] A series of trials were conducted in different experimental and feeding conditions to evaluate a purified and enriched lignin extracted from Eucalyptus grandis (LIPE®) as a marker to estimate faecal output in sheep fed temperate and tropical grasses. Two indoor trials were conducted in metabolism cages: the first one (Trial I) was conducted with sheep fed Italian ryegrass (Lolium multiflorum Lam.) pastures, which was evaluated in two different periods [Period I (n = 14), and Period II (n = 15)], and the second one (Trial II) was performed with sheep fed pearl millet [Pennisetum americanum (L.) Leeke] pastures (n = 16). Grazing trials were performed with sheep grazing Italian ryegrass [Trial III (n = 62)] and pearl millet [Trial IV (n = 34)]. According to the manufacturer's statements, sheep were dosed once a day with capsules containing 250 mg of LIPE® for a period of seven days, beginning two days before total faecal collections started and finishing on the last faecal collection day. To measure the observed daily faecal output, sheep were harnessed with faecal bags that were emptied once a day at 0800 h for five days. Faecal subsamples from indoor and grazing trials were taken to determine the LIPE® content by infrared spectroscopy. Regression analyses performed between estimated and observed faecal output (g DM/kg LW/day) by sheep were not significant (p > 0.05) in three of the four evaluated trials. Faecal LIPE® recovery from the total data of the four trials showed a statistical difference when compared to the reference value (100%). In conclusion, our results show that the LIPE® marker presents low accuracy to estimate the daily faecal output of sheep fed temperate (Italian ryegrass) and tropical (pearl millet) grasses.
Disciplines :
Animal production & animal husbandry
Author, co-author :
Amaral, Gláucia Azevedo do; Department of Agricultural Diagnosis and Research, Hulha Negra, Brazil
Azevedo, Eduardo Bohrer de ; Department of Animal Science, Federal University of Santa Maria, Santa Maria, Brazil ; Federal University of Pampa, Itaqui, Brazil
Savian, Jean Víctor; Instituto Nacional de Investigación Agropecuaria (INIA). Programa Pasturas y Forrajes. Estación Experimental INIA Treinta y Tres, Treinta y Tres, Uruguay
Bremm, Carolina; Department of Agricultural Diagnosis and Research, Porto Alegre, Brazil ; Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
David, Diego Bitencourt de; Federal University of Pampa, Itaqui, Brazil ; Department of Agricultural Diagnosis and Research, São Gabriel, Brazil
Gonda, Horacio Leandro ; Swedish University of Agricultural Sciences, Uppsala, Sweden
Bindelle, Jérôme ; Université de Liège - ULiège > TERRA Research Centre > Ingénierie des productions animales et nutrition
Carvalho, Paulo César de Faccio; Grazing Ecology Research Group, Federal University of Rio Grande do Sul, Porto Alegre, Brazil
Language :
English
Title :
Purified and enriched lignin as a marker to estimate faecal output of sheep fed temperate and tropical grasses
CAPES - Coordenação de Aperfeicoamento de Pessoal de Nível Superior [BR] CNPq - Conselho Nacional de Desenvolvimento Científico e Tecnológico [BR]
Funding text :
The authors would like to thank the financial support from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - Brasil (CAPES) and National Council for Scientific and Technological Development - Brasil (CNPq).
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