Effects of grain level on lamb performance, ruminal metabolism and leptin mRNA expression in perirenal adipose tissue
Pedro A. Hernández A , Germán D. Mendoza B D , A. Castro B , A. Lara C , F. X. Plata B , J. A. Martínez B and S. Ferraro B
+ Author Affiliations
- Author Affiliations
A Centro Universitario UAEM Amecameca, Universidad Autónoma del Estado de México, Estado de México, C.P. 56900, México.
B Maestría en Ciencias Agropecuarias, Universidad Autónoma Metropolitana Unidad Xochimilco, D.F. México C.P. 04960, Mexico.
C Departamento de Zootecnia, Universidad Autónoma Chapingo, Estado de México, C.P. 56230, México.
D Corresponding author. Email: gmendoza@correo.xoc.uam.mx
Animal Production Science 57(10) 2001-2006 https://doi.org/10.1071/AN15564
Submitted: 4 July 2015 Accepted: 10 July 2016 Published: 13 April 2017
Abstract
The effects of four different grain composition diets of finishing lambs on lamb performance, dry matter (DM) digestibility, rumen fermentation and leptin mRNA expression were evaluated. Thirty-two Pelibuey lambs (25.35 ± 4.73 kg bodyweight) were used in a completely randomised experiment in which lambs were fed diets that contained 30%, 45%, 60% or 75% grain (DM basis). The results indicated that increasing the grain level improved the average daily weight gain, hot carcass weight, DM digestibility and feed conversion linearly (P < 0.01); however, feed intake was not affected. Ruminal pH decreased linearly as the grain content was increased (P < 0.01). Ruminal propionate concentration increased and acetate concentration declined with increased grain content (P < 0.01). Leptin mRNA expression in perirenal adipose tissue increased linearly (P < 0.05) as grain content increased. Based on these results, we conclude that increasing grain level in the diets of finishing feedlot lambs improved weight gain and feed efficiency; however, because weight gain and feed efficiency were similar at the higher grain levels, our data suggest including 60% grain in lamb finishing rations.
Additional keywords: finishing lambs, grains.
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