Growth rate and carcass characteristics of Scottish Blackface and Texel x Scottish Blackface lambs offered forage brassica, perennial ryegrass or cereal based concentrate diets

IF 1.9 3区农林科学 Q2 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Livestock Science Pub Date : 2025-06-27 DOI:10.1016/j.livsci.2025.105765

M.A. Dolan , T.M. Boland , N.A. Claffey , F.P. Campion

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引用次数: 0

Abstract

This study examined the performance of lambs offered one of six diet types; ad-libitum concentrates (ALC), forage rape (Brassica napus L. FR), hybrid brassica (Brassica napus L. HB), kale (Brassica oleracea L. K), permanent pasture (predominantly Lolium perenne. PP) or reseeded perennial ryegrass (Lolium perenne. RS). Lamb grazing days (LGD) were higher for FR, HB and K compared to PP and RS (P < 0.05). Lambs offered ALC had higher average daily gain (ADG) compared to lambs offered FR, HB and K (P < 0.001). Lambs offered PP and RS had the lowest ADG (P < 0.05). Texel x Scottish Blackface (TXSB) lambs achieved a higher ADG compared to Scottish Blackface (SBF) entire males or SBF castrate males offered ALC, FR, HB, K and RS (P < 0.01). SBF entire males achieved a higher ADG compared to SBF castrate males offered ALC, FR and PP (P < 0.01). Lambs, slaughtered at ≥40 kg live weight, offered ALC had higher slaughter and carcass weights compared to lambs offered FR, HB and K (P < 0.0001). TXSB lambs had lower carcass fat and superior carcass conformation than SBF entire males and SBF castrate males (P < 0.001). The results indicate that ALC diet maximises ADG, but lambs offered FR, HB and K outperform those offered PP and RS during autumn/winter grazing. PP and RS swards were inadequate for finishing lambs in the autumn/winter period due to the decline in nutritive quality and lower LGD compared to FR, HB and K.

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饲喂草料芸苔、多年生黑麦草和谷类精饲粮的苏格兰黑脸羔羊和特克斯苏格兰黑脸羔羊的生长速率和胴体特性

本研究考察了饲喂6种饲粮中的一种的羔羊的生产性能；任意浓缩（ALC），草料油菜（Brassica napus L. FR），杂交油菜（Brassica napus L. HB），甘蓝（Brassica oleracea L. K），永久牧草（主要是黑麦草）。或复播多年生黑麦草（Lolium perenne）。RS)。羔羊放牧日数（LGD）中FR、HB和K高于PP和RS (P <；0.05)。饲喂ALC的羔羊平均日增重（ADG）高于饲喂FR、HB和K的羔羊。0.001)。饲喂PP和RS的羔羊平均日增重（P <）最低；0.05)。与提供ALC、FR、HB、K和RS的苏格兰黑脸（TXSB）羔羊相比，苏格兰黑脸（SBF）全公羊或SBF阉割公羊的平均日增重更高(P <；0.01)。与提供ALC、FR和PP的SBF去势雄性相比，SBF全雄的平均日增重更高(P <；0.01)。≥40 kg活重屠宰时，与饲喂FR、HB和K的羔羊相比，饲喂ALC的羔羊屠宰和胴体重更高(P <；0.0001)。与SBF全公羊和SBF去势公羊相比，TXSB羔羊的胴体脂肪更低，胴体形态更优(P <；0.001)。结果表明，在秋冬放牧期间，ALC饲粮的平均日增重最高，但FR、HB和K的表现优于PP和RS。与FR、HB和K相比，PP和RS母猪的营养品质下降，LGD较低，因此不适合秋冬育肥羔羊。

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来源期刊

Livestock Science 农林科学-奶制品与动物科学

CiteScore

4.30

自引率

5.60%

发文量

237

审稿时长

3 months

期刊介绍： Livestock Science promotes the sound development of the livestock sector by publishing original, peer-reviewed research and review articles covering all aspects of this broad field. The journal welcomes submissions on the avant-garde areas of animal genetics, breeding, growth, reproduction, nutrition, physiology, and behaviour in addition to genetic resources, welfare, ethics, health, management and production systems. The high-quality content of this journal reflects the truly international nature of this broad area of research.