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首页> 外文期刊>Plant and Soil >Effect of system of lamb rearing and season on early post-partum fertility of ewes and growth performance of lambs in Katahdin sheep
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Effect of system of lamb rearing and season on early post-partum fertility of ewes and growth performance of lambs in Katahdin sheep

机译：羊肉饲养系统对母羊母羊母羊及羊羔生长性能的影响

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The effect of season (S), lamb rearing system (RT) and grain supplementation (GS) on post-partum fertility in Katahdin ewes and growth in Katahdin lambs was evaluated. Katahdin ewes were bred to lamb in fall (n=36) or spring (n=56) and at approximately 2.5months post-partum were randomly assigned to be permanently separated or to continue to suckle their lambs for an additional 3months. All ewes were joined with rams following treatment to synchronize oestrus. Weaned (W, n=84) and continuously suckled lambs (CSK, n=88) were fed forage only (n=84; hay and pasture for fall- and spring-born lambs respectively) or were supplemented (n=88; 18% crude protein ration adlibitum) and all weighed biweekly. Ewes rebred in the fall had a shorter ram introduction to lambing interval (p0.05), higher prolificacy (p=0.001) and higher lambing rates (p=0.02); however, the proportion of ewes lambing was not affected by season. The first service lambing rate was lower in ewes continuously suckling lambs in the spring, but not in the fall breeding season (SxRT, p=0.03). Lambs that continuously suckled their dams and were supplemented grew quicker and gained more (p0.001) than their weaned and unsupplemented counterparts. The effect of CSK on growth rate of lambs was greater in the spring (RTxS; p=0.05), and the effect of supplementation on growth rate of lambs was greater in the fall (GSxS; p0.0001). In conclusion, Katahdin lambs achieved higher weight gains from continuous suckling and grain supplementation. Moreover, Katahdin ewes are capable of early rebreeding post-partum while suckling their lambs, which makes them suited for use in accelerated lambing programmes.
机译：评估了季节，羊肉饲养系统（RT）和谷物补充（GS）对Katahdin eWes和Katahdin Lambs的生长的枸杞生育能力的影响。 Katahdin EWES在秋季（n = 36）或弹簧（n = 56）中留下羊肉，随机分配大约2.5个月的枸杞，以永久分离或继续向羊羔吸吮羊羔另外3个月。在治疗后，所有母羊都与RAMS加入，以同步发情。断奶（W，N = 84）和连续使用羔羊（Csk，n = 88）仅饲料（n = 84;分别为秋季和春出的羊草的干草和牧场）或补充（n = 88; 18 ％粗蛋白质配给adlibitum），所有均等。秋季重建的母羊在羔羊间隔（P <0.05）的较短RAM介绍，较高的（P = 0.001）和较高的羔羊率（P = 0.02）;然而，母羊羔羊的比例不受季节的影响。母羊在春季连续乳羊羔连续吮吸羊羔，但不在秋季繁殖季节（SXRT，P = 0.03）中，第一次使用羔羊率较低。羊羔连续吮吸水坝并补充的羔羊越来越快，比他们的断奶和未补充的对应更快地增长并获得更多（P <0.001）。 CSK对弹簧（RTXS的乳绒生长速率的影响较大，秋季（GSXS; P <0.0001），补充对羔羊生长速率的影响更大。总之，Katahdin Lambs从连续哺乳和谷物补充中获得了更高的重量。此外，Katahdin Ewes能够早期重新释放产后的羔羊，这使其适用于加速的羔羊计划。

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