Effects of physical or fenceline boar exposure and exogenous gonadotropins on puberty induction and subsequent fertility in gilts.
Effects of physical or fenceline boar exposure and exogenous gonadotropins on puberty induction and subsequent fertility in gilts.
复制标题
物理或栅栏公猪暴露和外源性促性腺激素对后备母猪青春期诱导和随后生育力的影响。
DOI：
10.1093/jas/skab348
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发表时间：
2021
影响因子：
3.3
通讯作者：
Foxcroft,GeorgeR
中科院分区：
文献类型：
--
作者：
Knox,RobertV;Arend,LidiaS;Buerkley,AshleyL;Patterson,JenniferL;Foxcroft,GeorgeR
本研究是一项更大的实验的一部分，该实验评估了原产地垫料对后备母猪生产的影响。本研究的目的是确定商业农场环境中物理或栅栏公猪暴露和外源性促性腺激素对青春期诱导和随后的生育能力的影响。该实验一式三份进行。青春期前的后备母猪按栏（13 只/栏）分配，从 184 日龄开始，在专门设计的公猪暴露区 (BEAR) 中每天接受 15 分钟的 Fenceline（FBE，n = 153）或物理（PBE，n = 154）公猪暴露（BE），持续 3 周。在第 3 周开始时，青春期前的后备母猪被随机分配接受 PG600 或不接受（对照）。从第 4 周到第 6 周，仅使用 FBE 检查发情期。在第 1 至 3 周期间，每周测量一次生殖状态，或者直到发情为止。一旦检测到第一次发情，后备母猪就被重新安置在栏位中，并在第二次发情时进行授精。与 FBE 相比，PBE 分别降低了年龄（P= 0.001）和进入青春期的天数（P= 0.002），增加了第 1 周发情母猪的比例（P= 0.04）（38.3 vs. 27.5%），并倾向于（P= 0.08）改善第 2 周的发情情况（37.6 vs. 26.1%）。在第 3 周，与 PBE-对照 (40.3%)、FBE-PG600 (56.4%) 和 FBE-对照 (47.8%) 相比，接受 PBE-PG600 的青春期前后备母猪更多表现出发情 (P= 0.04；81.8%)。总体而言，PBE 至第 6 周的发情表达倾向 (P= 0.08) 高于 FBE（91.5% vs. 85.0%）。在 1 至 4 胎次中，PBE 增加（P≤0.05）或趋于增加（P>0.05 和 ≤0.10）配种率和产仔率，但在胎次内，对生猪生产或断奶到配种间隔没有影响（P>0.10）。分析还表明，从公猪接触开始到青春期的几周、产仔数性状和青春期卵泡测量值与随后的生育力相关。本研究的结果证实了在商业环境中增加公猪暴露强度并结合 PG600 治疗有效诱导青春期发情的优势。
The present study was part of a larger experiment that evaluated litter of origin effects on gilt production. The objectives of this study were to determine the effect of physical or fenceline boar exposure and exogenous gonadotropins on puberty induction and subsequent fertility in a commercial farm environment. The experiment was performed in three replicates. Prepubertal gilts were assigned by pen (13/pen) to receive 15 min of daily Fenceline (FBE, n = 153) or Physical (PBE, n = 154) Boar Exposure (BE) for 3 weeks starting at 184 d of age in a purpose-designed Boar Exposure Area (BEAR). At the start of week 3, prepubertal gilts were randomly assigned to receive PG600 or none (Control). From weeks 4 to 6, estrus was checked using only FBE. During weeks 1 to 3, measures of reproductive status were obtained weekly or until expression of estrus. Upon detection of first estrus, gilts were relocated into stalls and inseminated at second estrus. PBE reduced age (P= 0.001) and days to puberty (P= 0.002), increased the proportion of gilts in estrus (P= 0.04) in week 1 (38.3 vs. 27.5%), and tended (P= 0.08) to improve estrus in week 2 (37.6 vs. 26.1%) compared to FBE, respectively. In week 3, more prepubertal gilts receiving PBE-PG600 exhibited estrus (P= 0.04; 81.8%) compared to PBE-Control (40.3%), FBE-PG600 (56.4%), and FBE-Control (47.8%). Overall, expression of estrus through week 6 tended (P= 0.08) to be greater for PBE than FBE (91.5 vs. 85.0%). PBE increased (P≤ 0.05) or tended to increase (P> 0.05 and ≤0.10) service and farrowing rates in parities 1 through 4, but within parity, there were no effects (P> 0.10) on pig production or wean to service interval. Analyses also indicated that weeks from start of boar exposure to puberty, litter of origin traits, and follicle measures at puberty were related to the subsequent fertility. The results of this study confirm the advantages of using increased intensity of boar exposure, combined with PG600 treatment, for effective induction of pubertal estrus in a commercial setting.