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首页> 外文期刊>Small Ruminant Research >The effect of nutrition prior to and during mating on ovulation rate, reproductive wastage, and lambing rate in three sheep breeds
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The effect of nutrition prior to and during mating on ovulation rate, reproductive wastage, and lambing rate in three sheep breeds

机译：交配前和交配期间营养对三种绵羊品种的排卵率，生殖浪费和产羔率的影响

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The effects of moderate (M) and high (H) levels of nutrition prior to and during mating were evaluated according to the reproductive performance of 46 Queue Fine de 1'Ouest (QFO), 45 D'Man and 40 D'Man x QFO ewes. For 6 weeks prior to synchronised mating and 3 weeks thereafter, ewes in M treatment were given a diet providing, proportionately, 1.0 for QFO and D'Man x QFO and 1.5 for the D'Man of the estimated metabolizable energy (ME) requirements for maintenance. Ewes in H treatment were fed a daily diet providing 1.6 for the QFO and D'Man x QFO ewes and 2.2 for D'Man ewes of the ME requirements for maintenance. Live-weight change was recorded and reproductive performance measured from the cyclic ovarian activity (COA) and corpora lutea (CL) counts at the induced oestrus as well as the incidence of lambing and the number of lambs born. Neither breed nor the nutritional level significantly influenced the magnitude of live-weight changes between the start of the experimental nutritional treatments and the start of the mating period, a time at which 94-100% of ewes in all treatment groups were found to be cycling. At the induced oestrus, ovulation rate (OR) averaged 1.57 per ewe and a positive response of OR to improved nutrition was recorded in the prolific D'Man breed (2.26 in H ewes versus 1.78 in M ewes; P < 0.05). When conception occurred at the induced oestrus, breed of sheep x level of nutrition interaction significantly influenced litter size (LS). Ewes from the H group of the low prolific QFO breed produced less lambs than M ewes (1.00 versus 1.25), and in terms of LS distribution, a higher proportion of M than H ewes produced twins (P < 0.01). Conversely, H ewes of the prolific D'Man breed yielded more lambs than did M ewes (1.94 versus 1.52; P < 0.05). In the three studied breeds, reproductive losses increased with OR. They tended to be higher in H than M ewes of both the QFO and D'Man ewes. Results demonstrated important interactions between sheep breeds with different inherent twinning rates and levels of nutrition around the time of mating,.
机译：根据46 Queue Fine de 1'Ouest（QFO），45 D'Man和40 D'Man x QFO的繁殖性能，评估交配之前和交配过程中中等（M）和高（H）营养水平的影响母羊。在同步交配前的6周内和此后的3周内，给予M处理的母羊饮食，按比例提供QFO和D'Man x QFO的1.0和D'Man的1.5的估计代谢能（ME）保养。接受H处理的母羊每日饲喂QFO和D'Man x QFO母羊1.6份，满足维护要求的D'Man母羊2.2份。记录体重变化，并通过诱导的发情期的循环卵巢活动（COA）和黄体（CL）计数来测量生殖性能，以及产羔的发生率和出生的羔羊数。在实验性营养治疗开始至交配期开始之间，品种和营养水平均未显着影响活体重量的变化幅度，在该时间段内，所有治疗组中94-100％的母羊都处于循环中。在诱导的发情期，排卵率（OR）平均为每只母羊1.57，并且在多产的D'Man品种中记录到OR对改善营养的积极反应（母羊为2.26，母羊为1.78; P <0.05）。当受孕的发情期受孕时，绵羊的品种×营养相互作用水平显着影响产仔数（LS）。低产QFO品种H组的母羊产生的羔羊少于母羊（1.00对1.25），就LS分布而言，M母羊的比例高于产生双胞胎的母羊（P <0.01）。相反，高产德曼犬种的公羊比母羊多（1.94比1.52; P <0.05）。在三个研究品种中，生殖损失随OR的增加而增加。它们的H值往往高于QFO和D'Man母羊的Mew。结果表明，在交配期间，具有不同固有孪生率和营养水平的绵羊品种之间存在重要的相互作用。

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