CAN COMPENSATORY GROWTH MITIGATE A FEEDING RESTRICTION IN GROWING LAMBS?

IF 0.3 Q4 AGRONOMY

Chilean Journal of Agricultural & Animal Sciences Pub Date : 2019-12-01 DOI:10.4067/s0719-38902019005000403

S. Luzardo, J. Clariget, G. Banchero

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Abstract

The aim of the study was to evaluate compensatory growth in lambs under semi-extensive growing conditions utilizing pasture haylage from Lotus uliginosus cv. E-Tanin as the main feed resource. Single (n = 36) and twin-born (n = 35) crossed Polwarth x Finnish Landrace lambs were assigned to three feeding treatments (restriction period) to achieve: low weight gain (LWG) less than 30 g a-1 d-1, medium weight gain (MWG) ~ 60 g a-1 d-1; and high weight gain (HWG) (~90 g a-1 d-1 for 82 days. Lambs were offered pasture haylage at LWG, haylage plus corn at MWG, and haylage plus corn and soybean meal at HWG, restricted at 2.5 to 3% of BW. Afterwards, lambs were individually penned and fed ad libitum for 82 days (refeeding phase). Live weight and feed intake (FI) were recorded during the experimental period, and average daily gain (ADG) and feed conversion ratio (FCR) were estimated. Ribeye area (REA) and fat depth (FAT) were measured in the refeeding phase. Both ADG and FI were significantly different (P < 0.05) among treatments (HWG > MWG > LWG) in the feeding restriction period. FCR did not differ (P > 0.05) between MWG and HWG but were lower (P < 0.05) than LWG. No differences (P > 0.05) were found in ADG between single and twin-born lambs during the refeeding period. Initial and final REA was greater (P < 0.05) in MWG and HWG than LWG. Even though haylage is a cheap feed alternative in semi-extensive production systems, it does not enable a full compensatory growth of LWG and MWG lambs.

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补偿生长能缓解生长中羔羊的进食限制吗？

本研究的目的是评价以莲花（Lotus uliginosus cv.E-Tanin）牧草为主要饲料资源的半粗放生长条件下羔羊的补偿生长。将Polwarth x Finnish Landrace杂交羔羊的单胎（n=36）和双胎（n=35）分为三个饲养处理（限制期）：低增重（LWG）小于30g a-1 d-1，中等增重（MWG）～60g a-1 d-1；和高增重（HWG）（~90 g a-1 d-1，持续82天。在LWG给羔羊提供牧场干草，在MWG给羔羊干草加玉米，在HWG给羔羊草料加玉米和豆粕，限制在体重的2.5%至3%。然后，羔羊被单独圈养并随意喂养82天（再喂养阶段）。记录实验期间的活重和采食量（FI），并估计平均日增重（ADG）和饲料转化率（FCR）。在再喂养阶段测量肋骨面积（REA）和脂肪深度（fat）。在限饲期内，各处理（HWG>MWG>LWG）的ADG和FI均有显著差异（P<0.05）。MWG和HWG之间的FCR没有差异（P>0.05），但低于LWG（P<0.05）。单胎和双胎羔羊在再喂养期间的ADG没有差异（P>0.05）。MWG和HWG的初始和最终REA大于LWG（P<0.05）。尽管干草在半粗放生产系统中是一种廉价的饲料替代品，但它并不能使LWG和MWG羔羊完全补偿性生长。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Chilean Journal of Agricultural & Animal Sciences AGRONOMY-

CiteScore

0.70

自引率

0.00%

发文量

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