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Abstract：
The present study evaluated the effects of omega-3 (ω-3) fatty acid-rich linseed supplementation on the reproductive performance, endocrine profile, and biochemical profile of ewes reared in subtropical climates. Forty-eight acyclic and clinically healthy Marwari sheep, aged 1.5-2.5 years with no parity, were divided into four groups (n = n = 12 in each). Ewes in the control group (group I) were fed only a basal feed, whereas ewes in the treatment groups II, III, and IV were fed the basal diet along with 10%, 15%, and 20% linseed, respectively, daily on a dry matter basis. The experiment was conducted during the typical breeding season (October-November) of the sheep. The estrus induction rate was significantly higher (p < 0.05) in all treatment groups than in the control group. The estrus induction interval was significantly lower (p < 0.05) in group III. The conception rate in group I was significantly lower (p < 0.05). In addition, ewes in the control group had a significantly lower (p < 0.05) lambing rate than all treatment groups. Serum progesterone concentrations differed significantly (p < 0.05) between the control and the treatment groups on days 15, 30, 45, and 60 of supplementation. On treatment days 15 and 30, the serum estrogen concentrations were significantly higher (p < 0.05) in all treatment groups compared to that in group I. In all treatment groups, monounsaturated fatty acid (MUFA) decreased significantly (p < 0.05), whereas polyunsaturated fatty acid (PUFA) increased significantly (p < 0.05) from day 15 onward. In conclusion, by providing 15% dietary linseed supplementation to ewes, their reproductive performance can be improved in subtropical climates. Future studies are recommended to further elucidate the role of linseed supplementation in sheep reproduction in subtropical climates.
摘要：
本研究评估了富含omega-3（ω-3）脂肪酸的亚麻籽补充剂对繁殖性能的影响，内分泌概况,和在亚热带气候下饲养的母羊的生化特征。48只无环和临床健康的马瓦里羊，1.5-2.5岁，没有平价，分为四组(每组n=12)。对照组（I组）的母羊仅饲喂基础饲料，而处理组II的母羊，III,IV和10%的基础饮食一起喂养，15%,和20%的亚麻籽,分别,每天以干物质为基础。实验是在绵羊的典型繁殖季节（10月至11月）进行的。所有治疗组的发情诱导率均明显高于对照组（p<0.05）。第III组的发情诱导间隔显着降低（p<0.05）。Ⅰ组受胎率明显较低(p<0.05)。此外,对照组母羊产仔率明显低于各治疗组(p<0.05)。在补充的第15、30、45和60天,对照组和治疗组之间的血清孕酮浓度显著不同(p<0.05)。在治疗第15天和第30天，所有治疗组的血清雌激素浓度均明显高于I组（p<0.05）。在所有治疗组中，单不饱和脂肪酸(MUFA)显著降低(p<0.05),而多不饱和脂肪酸(PUFA)从第15天开始显著增加(p<0.05)。总之,通过向母羊提供15%的膳食亚麻籽补充剂，在亚热带气候下，它们的繁殖性能可以得到改善。建议进一步研究亚热带气候中补充亚麻籽在绵羊繁殖中的作用。
