Gallego-Calvo L, Gatica M C, Guzmán J L, Zarazaga L A
Departamento de Ciencias Agroforestales, Universidad de Huelva, "Campus de Excelencia Internacional Agroalimentario, ceiA3", Carretera Huelva-Palos de la Frontera s/n, 21819 Palos de la Frontera, Huelva, Spain.
Universidad Arturo Prat, Facultad de Recursos Naturales Renovables, Avenida Arturo Prat, 2120 Iquique, Chile.
Anim Reprod Sci. 2014 Dec 30;151(3-4):157-63. doi: 10.1016/j.anireprosci.2014.10.011. Epub 2014 Oct 18.
The reproductive activity of 84 female Blanca Andaluza goats was monitored over 17 months to determine the role of body condition score (BCS) and body weight (BW) in its control. Following a 3×2 factorial experimental design, the animals were allocated to three groups: low BCS (≤2.50, n=24), medium BCS (BCS=2.75-3.00, n=31) and high BCS (≥3.25, n=29). The same animals, irrespective of the BCS group categorization, were also divided into two groups depending on BW: low BW (≤40kg, n=44) and high BW (>40kg, n=40). Oestrus was evaluated daily using vasectomised males. The ovulation rate was assessed by trans-rectal ultrasonography after the identification of oestrus. Ovulations were determined by monitoring the plasma progesterone concentration weekly. The BCS and BW were recorded once a week and nutritional status adjusted to maintain the initial differences in BW and BCS between the groups. Both BCS and BW had a significant (at least P<0.05) influence on the onset, the end, and the duration of the breeding season, with longer periods of reproductive activity recorded in does with a BCS of ≥2.75 and BW of >40kg. No significant interaction between these variables was observed. Some (11.7%) of the does in the groups with animals of BCS≥2.75 had ovulations during seasonal anoestrus. None of the does with a BCS of ≤2.5 had ovulations during seasonal anoestrus. The ovulation rate of the first and last oestrus was influenced by BW (P<0.01). These results demonstrate that Blanca Andaluza goats show marked reproductive seasonality that is clearly and independently modulated by BCS and BW.
对84只布兰卡·安达卢西亚母羊的繁殖活动进行了17个月的监测，以确定体况评分（BCS）和体重（BW）在其繁殖控制中的作用。按照3×2析因实验设计，将这些动物分为三组：低体况评分组（≤2.50，n = 24）、中等体况评分组（BCS = 2.75 - 3.00，n = 31）和高体况评分组（≥3.25，n = 29）。同样这些动物，不考虑BCS分组情况，还根据体重分为两组：低体重组（≤40kg，n = 44）和高体重组（>40kg，n = 40）。每天使用输精管结扎的公羊评估发情情况。在确定发情后，通过经直肠超声检查评估排卵率。通过每周监测血浆孕酮浓度来确定排卵情况。每周记录一次BCS和BW，并调整营养状况以维持各组之间BW和BCS的初始差异。BCS和BW对繁殖季节的开始、结束和持续时间均有显著影响（至少P<0.05），BCS≥2.75且BW>40kg的母羊繁殖活动持续时间更长。未观察到这些变量之间有显著交互作用。在BCS≥2.75组的母羊中，有一些（11.7%）在季节性乏情期排卵。BCS≤2.5的母羊在季节性乏情期均未排卵。首次和末次发情的排卵率受BW影响（P<0.01）。这些结果表明，布兰卡·安达卢西亚母羊表现出明显的繁殖季节性，且体况评分和体重对其有明确且独立的调节作用。
