This work examined the effect of acute nutritional restriction or supplementation one week before male introduction on the reproductive performances of the “male effect” when using photostimulated or control males in goats. On 22 March, 84 anoestrous does were placed with photostimulated bucks or with bucks which had received no treatments. One week before male introduction, the females were provided with different nutritional regimes: Supplemented, restricted or control females. The non-esterified fatty acids (NEFAs) and Insulin Growth Factor-1 (IGF-1) concentrations were measured in the same samples. Fecundity, fertility, prolificacy and productivity were also determined. No interaction between both sources of variation was observed in any of the reproductive variables studied. Treatment of the bucks increased the percentage of females expressing behavioural oestrous associated with ovulation (71% vs 90% for Natural and Photo groups, respectively, P < 0.05). The Supplemented females showed higher ovulation rate than Restricted females (1.77 ± 0.13 vs 1.05 ± 0.05, P < 0.001), fecundity (71% vs 43%, P < 0.05); fertility (76% vs 29%, P < 0.05) and productivity (1.00 ± 0.15 vs 0.29 ± 0.11 kids per female, P < 0.01). In the Supplemented females, the higher reproductive results could be due to the lower NEFAs and higher IGF-1 concentrations at ovulation and at the time of oestrus compared to the Restricted females. Thus, the present experiment results demonstrate that nutrition is an important factor in the response to the “male effect” at Mediterranean latitudes, and its negative effect cannot be counterbalanced by using photostimulated bucks.

这项工作检查了在引入山羊前一周急性营养限制或补充对“雄性效应”的繁殖性能的影响，即在山羊中使用光刺激或对照雄性时。3 月 22 日，将 84 只无发情的雄鹿与光刺激雄鹿或未接受任何治疗的雄鹿放置在一起。在引入雄性前一周，为雌性提供不同的营养方案：补充、限制或控制雌性。在相同样品中测量了非酯化脂肪酸 (NEFA) 和胰岛素生长因子-1 (IGF-1) 的浓度。还测定了繁殖力、生育力、多产和生产力。在研究的任何生殖变量中都没有观察到两种变异来源之间的相互作用。对自然组和照片组分别为90%，P  < 0.05）。补充女性的排卵率高于限制女性（1.77 ± 0.13对1.05 ± 0.05，P  < 0.001），繁殖力（71%对43%，P  < 0.05）；生育率（76% vs 29%，P  < 0.05）和生产力（1.00 ± 0.15 vs 0.29 ± 0.11 个孩子，每名女性，P < 0.01)。在补充的雌性中，与限制性雌性相比，较高的繁殖结果可能是由于排卵时和发情时的 NEFA 较低和 IGF-1 浓度较高。因此，目前的实验结果表明，营养是地中海纬度“雄性效应”反应的重要因素，其负面影响无法通过使用光刺激雄鹿来抵消。