定时输精对经产母猪繁殖性能及生殖激素的影响

doi:10.16431/j.cnki.1671-7236.2021.10.024

Abstract

Abstract: The purpose of this study was to establish an efficient timed artificial insemination (TAI) technology for multiparous sows. The experiment studied the effects of timed insemination on the reproductive performance of multiparous sows, the interval between weaning and farrowing, the farrowing performance of sows with different parities and the serum reproductive hormone levels within 7 days after weaning. A total of 309 binary (Landrace×Large White) sows of 2-8 parity randomly divided into control group and test group. The sows of control group were subjected to conventional artificial insemination (AI), and the sows of test group were given TAI by PMSG (1 000 IU) treatment for 24 h after weaning and GnRH (100 μg) treatment at 72 h interval, then followed by inseminations at 24 and 40 h after GnRH injection. The effects of timing insemination on reproductive performance of multiparous sows were evaluated by counting estrus rate in one week after weaning, conception rate, delivery rate and litter size. The effect of regular insemination on weaning delivery interval of multiparous sows was detected through the statistics of weaning time and delivery time. The radioimmunoassay (RIA) method was used to detect the serum E₂, LH, FSH and P₄ levels of sows with 2 to 4 parities within one week of weaning to study the effect of timed insemination on the reproductive hormones of sows. The results showed that the estrus rate of sows in the test group was significantly higher than that in the control group (P<0.05), but the conception rate and delivery rate were not significantly different between the two groups (P>0.05). Litter size per litter, qualified litter size per litter and reproductive efficiency increased, but the difference was not significant (P>0.05). Timed insemination significantly shortened the interval between weaning and farrowing (P<0.05). The estrus rate, conception rate and delivery rate of 3-4 litter sows were significantly higher than those of the control group (P<0.05). In terms of reproductive hormone, the E₂ level of the test group rose rapidly after PMSG injection, and was continuously higher than that of the control group (P<0.05) within 66 to 96 h after the timed insemination treatment. The level of P₄ in the experimental group was significantly lower than that in the control group from weaning to mating (P<0.05), but increased rapidly after mating, and higher than the control group. There was no significant difference in the content of LH and FSH between the two groups. In summary, timed insemination could effectively increase the rate of weaning and estrus of multiparous sows, reduce the number of non-productive days, and could significantly improve the reproductive performance of sows with 3 to 4 litters.

Key words: multiparous sows; timed artificial insemination(TAI); reproductive performance; reproductive hormone; parity

CLC Number:

S828

FAN Yushan, WU Junhui, GAO Fenglei, GUO Conghui, XIE Shaoyi, MENG Li, LI Li, ZHANG Shouquan, WEI Hengxi. Effects of Timed Artificial Insemination on Reproductive Performance and Reproductive Hormone in Multiparous Sows[J]. China Animal Husbandry and Veterinary Medicine, 2021, 48(10): 3726-3733.

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Effects of Timed Artificial Insemination on Reproductive Performance and Reproductive Hormone in Multiparous Sows

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