Growth rate and age at boar exposure as factors influencing gilt puberty
Growth rate and age at boar exposure as factors influencing gilt puberty
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DOI：
10.1016/j.livsci.2008.04.009
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发表时间：
2009-01-01
影响因子：
1.8
通讯作者：
Bortolozzo, F. P.
中科院分区：
文献类型：
--
作者：
Amaral Filha, W. S.;Bernardi, M. L.;Bortolozzo, F. P.
本研究的目的是验证公猪暴露开始时后备母猪的生长速度和年龄是否会影响青春期发情。根据公猪暴露时的两个年龄组（A= 130-149 d和B= 150-170 d）和三个生长速率等级（低=550 649 g/d;中等=650 725 g/d和高=726-830 g/d）评价后备母猪（n= 1486）。公猪暴露开始时，A组和B组后备母猪分别为142.6 +/- 4.9和157.0 +/- 5.1日龄。总体而言，85%的后备母猪在公猪暴露后40天内显示发情。在A组后备母猪中，观察到高生长率后备母猪在刺激后20天内的累计发情百分比高于（P < 0.05）中等和低生长率后备母猪（59.7% vs. 48.7% vs. 48.2%; P 0.05）。在A组内，高生长速率后备母猪的青春期提前于低生长速率后备母猪（159.6天与164.8天）。然而，当后备母猪在较大年龄时暴露于公猪时，青春期年龄不受生长速率的影响（第13组）。总体而言，青春期年龄与公猪暴露开始时的年龄呈正相关（r=0.38; P < 0.0001），公猪暴露时后备母猪年龄越大，间隔时间越短（r=-0.19; P <0.0001）。
The objective Of this Study was to verify whether pubertal estrus could be influenced by the growth rate and age of gilts at the onset of boar exposure. Gilts (n= 1486) were evaluated according to two groups of age at boar exposure (A= 130-149 d and B= 150-170 d) and three classes of growth rate (Low=550 649 g/d; Intermediate=650 725 g/d and High=726-830 g/d). Gilts of groups A and B were, respectively, 142.6 +/- 4.9 and 157.0 +/- 5.1 days of age at the onset of boar exposure. Overall, 85% of gilts showed estrus within 40 days of boar exposure. Within group A gilts a higher (P < 0.05) cumulative percentage of estrus within 20 days of stimulation was observed in High than in Intermediate and Low growth rate gilts (59.7% vs. 48.7% vs. 48.2%; P 0.05). Within group A, puberty was attained earlier in High than in Low growth rate gilts (159.6 vs. 164.8 days). However, age at puberty was not affected by growth rate, when gilts were exposed to boar in an older age (group 13). Overall, age at puberty was positively associated with the age at the onset of boar exposure (r=0.38; P < 0.0001) and the older the gilts were at boar exposure the lower was the interval (r=-0.19; P