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Relationship among serum metabolic hormones with pregnancy rates to fixed-time artificial insemination in Bos indicus beef females
Livestock Science ( IF 1.8 ) Pub Date : 2021-02-16 , DOI: 10.1016/j.livsci.2021.104451
R.F.G. Peres , R.F. Cooke , H. Dias , D.H. Keisler , K.G. Pohler , J.L.M. Vasconcelos

Two experiments compared body parameters and serum concentrations of GH, IGF-I, and leptin in Bos indicus females based on their pregnancy status to fixed-time artificial insemination (FTAI). In Exp. 1, 226 nulliparous heifers were assigned to a puberty induction protocol (d -35 to d -23), followed by an estrus synchronization and FTAI protocol (d -11 to 0). Heifers received a controlled internal progesterone releasing insert (CIDR) previously used three times on d -35, followed by 0.6 mg of estradiol cypionate and CIDR removal on d -23. Heifers received 2 mg of estradiol benzoate and a CIDR previously used twice on d -11, 12.5 mg of dinoprost tromethamine in addition to CIDR removal, 0.6 mg of estradiol cypionate and a 200 IU of eCG on d -2, followed by FTAI on d 0. Heifer BW and BCS were recorded on d -35, -11, and 30, whereas blood samples were collected on d -35, -23, -11, 0, and 30. In Exp. 2, 821 multiparous lactating Nelore beef cows were assigned to the estrus synchronization and FTAI protocol described in Exp. 1, but received 300 IU of eCG on d -2. Cow BW and BCS were recorded on d -11 and 30, and blood samples were collected on d -11, 0, and 30. In both experiments, pregnancy status was verified via transrectal ultrasonography on d 30. In Exp. 1, heifers that became pregnant had greater (P = 0.03) IGF-I concentrations on d 0 and less (P = 0.05) IGF-I concentrations on d 30 compared to heifers that did not become pregnant (pregnancy status × day; P < 0.01). No differences in BW, BCS, GH and leptin were detected (P ≥ 0.23) according to heifer pregnancy status. In Exp. 2, cows that became pregnant had less (P = 0.03) leptin concentrations on d -11, and less (P = 0.01) IGF-I concentrations on d 30 compared to cows that did not become pregnant (pregnancy status × day; P ≤ 0.05). No differences in BW, BCS, and GH were detected (P ≥ 0.15) according to cow pregnancy status. In summary, serum leptin at the beginning of estrus synchronization was negatively associated with pregnancy rates to FTAI in multiparous cows. A negative relationship was also observed between serum IGF-I during early gestation with pregnancy rates to FTAI across parities. These results provide novel insights on the relationships among metabolic hormones with reproductive performance of B. indicus females.



中文翻译:

Bos indicus牛肉雌性中血清代谢激素与妊娠率与固定时间人工授精的关系

两项实验根据固定怀孕时间的人工授精(FTAI),比较了Bos indicus女性的身体参数和GH,IGF-I和瘦素的血清浓度。在实验中 1,1,226位未产小母牛被分配到青春期诱导方案(d -35至d -23),然后进行发情同步和FTAI方案(d -11至0)。小母牛接受了受控的内部孕激素释放插入物(CIDR)先前在d -35时使用了3次,然后在d -23时使用了0.6 mg的雌二醇环戊酸酯和CIDR去除。小母牛在d -11时接受了2 mg苯甲酸雌二醇和先前使用过两次的CIDR,除CIDR去除外还接受了12.5 mg地诺前列素三甲胺,在d -2时接受0.6 mg环丙酸雌二醇和200 IU eCG,然后在d时接受FTAI 0.小母牛体重和BCS在d -35,-11、30和d时记录,而血液样本在d -35,-23,-11、0和30 d收集。在实验2中,将821头泌乳的Nelore多头奶牛分配给发情同步和FTAI协议中所述的协议。1,但在d -2时收到了300 IU的eCG。在第-11天和第30天记录奶牛的体重和BCS,并在第-11天,0和30天采集血样。在这两个实验中,在第30天通过经直肠超声检查确认怀孕状态。1,P  = 0.03) 与未怀孕的小母牛相比,第0天的IGF-I浓度小于等于0(P = 0.05)IGF-I的浓度(怀孕状态×天;P <0.01)。在BW没有差异,BCS,GH和瘦素检测(P 根据小母牛怀孕状况≥0.23)。在实验中 2,牛,成为怀孕具有较少(P  = 0.03)瘦素对d -11浓度,和更小(P  = 0.01)上d 30相比奶牛未怀孕(怀孕状况×天IGF-I的浓度; P  ≤ 0.05)。未检测到BW,BCS和GH的差异(P ≥0.15)根据母牛的怀孕状况。总之,发情同步开始时血清瘦素与多胎牛的FTAI妊娠率呈负相关。还观察到早期妊娠期间血清IGF-I与不同胎龄的FTAI妊娠率之间存在负相关。这些结果提供了关于代谢激素与印度双歧杆菌女性生殖能力之间关系的新颖见解。

更新日期:2021-02-19
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