Herath Hitihamy M G P, Pain Sarah J, Kenyon Paul R, Blair Hugh T, Morel Patrick C H
School of Agriculture and Environment, Massey University, Private Bag 11222, Palmerston North 4442, New Zealand.
Department of Livestock Production, Faculty of Agricultural Sciences, Sabaragamuwa University of Sri Lanka, Belihuloya 70140, Sri Lanka.
Animals (Basel). 2021 Nov 24;11(12):3370. doi: 10.3390/ani11123370.
This study was designed to investigate the influence of pellet fibre level, milk replacer composition and age at weaning on growth and body composition of lambs reared artificially. Romney ram lambs were randomly allocated to one of three rearing treatments; HFP57: commercial milk replacer to 57 days of age, and high fibre concentrate pellets; HFP42: commercial milk replacer with early weaning at 42 days of age, and high fibre concentrate pellets; LFP42: high protein milk replacer from 2-16 days of age followed by commercial milk replacer with early weaning at 42 days of age, and low fibre concentrate pellets. Lambs were slaughtered at 57 days of age. Overall average daily liveweight gain of lambs did not differ ( > 0.05) between treatments. Dressing out percentage, carcass weight, empty small intestine and omental fat were higher ( < 0.05) in HFP57 than in both HFP42 and LFP42 lambs. HFP42 and LFP42 lambs had heavier ( < 0.05) empty rumen weights. Whole body protein content was higher ( < 0.05) in HFP42 lambs compared to both HFP57 and LFP42 lambs. Fat content and daily fat deposition were greater ( < 0.05) in HFP57 lambs than HFP42 and LFP42 lambs. Weaning lambs at 42 days of age with provision of either low or high fibre concentrate pellets, resulted in similar growth rates, reduced whole body fat deposition and was a more cost-effective rearing regimen.
本研究旨在调查颗粒纤维水平、代乳粉成分和断奶年龄对人工饲养羔羊生长和体成分的影响。罗姆尼公羔羊被随机分配到三种饲养处理之一；HFP57：57日龄前使用商业代乳粉，并使用高纤维浓缩颗粒料；HFP42：42日龄早期断奶的商业代乳粉，并使用高纤维浓缩颗粒料；LFP42：2 - 16日龄使用高蛋白代乳粉，随后在42日龄早期断奶时使用商业代乳粉，并使用低纤维浓缩颗粒料。羔羊在57日龄时屠宰。各处理间羔羊的总体平均日增重无差异（>0.05）。HFP57组羔羊的屠宰率、胴体重、空小肠和网膜脂肪均高于HFP42组和LFP42组羔羊（<0.05）。HFP42组和LFP42组羔羊的空瘤胃重量较重（<0.05）。与HFP57组和LFP42组羔羊相比，HFP42组羔羊的全身蛋白质含量较高（<0.05）。HFP57组羔羊的脂肪含量和每日脂肪沉积量均高于HFP42组和LFP42组羔羊（<0.05）。42日龄断奶的羔羊，无论提供低纤维还是高纤维浓缩颗粒料，生长速度相似，全身脂肪沉积减少，是一种更具成本效益的饲养方案。
