Corn-based or high linoleic acid flushing increases productivity of Morada Nova and Brazilian Somalis ewes

SUMMARY The objective of this study was to compare the corn-based (FLU), high linoleic acid flushings(LAF), and a control treatment (un supplemented, CON); two genetic groups:Morada Nova (MN) and Brazilian Somalis (BS), on the productive and reproductive performance of ewes and their lambs. A total of 156 non-pregnant ewes were supplemented three weeks before and after the breeding season. Supplementation with either FLU or LAF increased ewe body condition score (BCS) at the beginning of the breeding season and at lambing compared to CON. The BS ewes had greater body weights at the supplementation end, and BCS both at the supplementation start, and at lambing compared to MN. Similarly, ewes with three lambs per birth had greater BCS at the beginning of supplementation. They also had greater weights at the beginning of the breeding season and at lambing. Both FLU and LAF increased total lamb weight from 56 to 105 days of age compared to CON.The BS ewes had decreased prolificity and produced lower total weight of lambs at lambing, but greater 84 and 105 days after birth compared to MN. Total lambweight at birth was greater for ewes that lambed three, followed by two and then one lamb per birth. In conclusion, the high linoleic acid and high corn supplementation increase body condition score of ewes form breeding season to lambing and enhance lamb performance after 56 days of age. Although Morada Nova ewes increased prolificacy, their lambs were lighter after they reached 84 days of age.

摘要：本研究旨在比较玉米基日粮（FLU）、高亚油酸冲洗补充料（LAF）与未添加对照组（CON）三种日粮处理，以及莫拉达诺瓦羊（MN）、巴西索马里羊（BS）两个遗传群体对母羊及其羔羊生产与繁殖性能的影响。试验共纳入156只未妊娠母羊，于配种季前后3周开展日粮补充饲喂。相较于对照组，饲喂FLU或LAF均可提升母羊在配种季起始时与产羔时的体况评分（Body Condition Score，BCS）。
BS组母羊在补充饲喂结束时的体重更高，且在补充起始阶段与产羔时的体况评分均优于MN组母羊。同理，每胎产羔3只的母羊，其补充起始时的体况评分更高，且在配种季开始时与产羔时的体重也更大。
相较于对照组，FLU与LAF两种补充方式均可提升羔羊56至105日龄时的总体重。BS组母羊的多产性更低，产羔时的羔羊总重量更少，但羔羊在出生后84日龄与105日龄时的体重均高于MN组母羊的羔羊。每胎产羔3只的母羊，其初生羔羊总重量最高，其次为产羔2只的母羊，产羔1只的母羊最低。
综上，高亚油酸与高玉米日粮补充均可提升母羊从配种季至产羔阶段的体况评分，并可改善羔羊56日龄后的生长性能。尽管MN组母羊的多产性更高，但其羔羊在84日龄后的体重相对更低。