Chai Jianmin, Diao Qiyu, Zhao Jiangchao, Wang Haichao, Deng Kaidong, Qi Minli, Nie Mingfei, Zhang Naifeng
Key Laboratory of Feed Biotechnology of the Ministry of Agriculture, Feed Research Institute of Chinese Academy of Agricultural Sciences, Beijing, China.
Department of Animal Science, Division of Agriculture, University of Arkansas, Fayetteville, AR, USA.
Anim Sci J. 2018 Aug;89(8):1178-1186. doi: 10.1111/asj.13013. Epub 2018 May 23.
To determine the effects of early rearing system on meat quality traits, fatty acid and amino acid profiles of meat, 48 Hu lambs were selected and randomly divided into four treatments: control lambs were ewe-reared from birth to 60 days of age (ER), while treatment lambs were segregated from their dams at 10, 20 and 30 days of age, then artificially reared with milk replacer until 60 days of age (EW10, EW20 and EW30, respectively). All lambs had no access to the milk replacer or their dams from 61 to 90 days. Creep feed was supplied ad libitum to all lambs from 15 to 90 days of age. Artificially reared lambs (EW10, EW20 and EW30) had higher (p < .05) creep feed intake, average daily gain, slaughter weight, hot carcass weight, meat ether extract content, bright meat color (lightness and yellowness) than ewe-reared lambs. The content of unsaturated fatty acids and monounsaturated fatty acids in EW10 and EW20 were greater (p < .05) than that in ER, whereas the proportions of saturated fatty acids in EW10 and EW20 were lower than that in ER (p < .05). The percentages of C18:0, C18:2, C18:3 and the ratio of polyunsaturated fatty acids and saturated fatty acids of artificially reared lambs were greater than ewe-reared lambs (p < .05). The meat proportions of leucine, alanine and proline were higher (p < .05) in artificially reared lambs than ewe-reared ones. Finally, the artificially reared system increased meat production and changed the fatty acid and amino acid profiles of meat, and it would be appropriate to rear Hu lambs artificially from 10 days with milk replacer.
为了确定早期饲养系统对肉品质性状、肉中脂肪酸和氨基酸谱的影响，选取48只湖羊羔羊并随机分为四个处理组：对照组羔羊从出生到60日龄由母羊饲养（ER），而处理组羔羊在10日龄、20日龄和30日龄时与母羊分开，然后用代乳粉人工饲养至60日龄（分别为EW10、EW20和EW30）。所有羔羊在61至90日龄期间无法获取代乳粉或母羊。从15至90日龄，所有羔羊均可自由采食开食料。人工饲养的羔羊（EW10、EW20和EW30）比由母羊饲养的羔羊具有更高（p <.05）的开食料采食量、平均日增重、屠宰体重、热胴体重、肉中乙醚提取物含量、肉的明亮色泽（亮度和黄度）。EW10和EW20中不饱和脂肪酸和单不饱和脂肪酸的含量高于ER组（p <.05），而EW10和EW20中饱和脂肪酸的比例低于ER组（p <.05）。人工饲养羔羊的C18:0、C18:2、C18:3百分比以及多不饱和脂肪酸与饱和脂肪酸的比例均高于由母羊饲养的羔羊（p <.05）。人工饲养羔羊的肉中亮氨酸、丙氨酸和脯氨酸的比例高于由母羊饲养的羔羊（p <.05）。最后，人工饲养系统提高了肉产量并改变了肉的脂肪酸和氨基酸谱，从10日龄开始用代乳粉对湖羊羔羊进行人工饲养是合适的。
