Hypothalamic control of gonadotrophin and prolactin secretion in pigs

Kraeling, Robert R.; Barb, C. R.

doi:10.1530/biosciprocs.13.001

Cited by 1 publication

(2 citation statements)

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“…Then, such medium follicles might have developed LH receptors for action of exogenously administered hCG on 9 th day. Further, there is species variation in the interplay actions of estrogen, Kisspeptin and GnRH to triger LH surge for estrus (Kraeling and Barb, 1990;Britt et al, 1991;Estienne et al, 1997;Casper, 2015). In comparison to other livestock species, much success has not been reported for improving reproductive efficiency using GnRH in Pig.…”

Section: Discussionmentioning

confidence: 99%

“…Initiation of puberty is dependent upon the activation of the hypothalamic– pituitary–gonadal axis. Puberty comes with activation of high-frequency pulses of LH (Diekman et al ., 1983; Lutz et al ., 1984; Camous et al ., 1985) that are driven by cyclic increases in the secretion of gonadotropin-releasing hormone (GnRH) from the hypothalamus (Lutz et al ., 1985; Kraeling and Barb, 1990). Inadequate gonadotropin secretion may result in pubertal failure and contributes to extended weaning to estrus intervals in postpartum sows (Edwards and Foxcroft, 1983).…”

Section: Introductionmentioning

confidence: 99%

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Hormonal Interventions for optimizing reproductive efficiency in pigs at Farmers’ field

Kumar

Islam

Banik

et al. 2023

Preprint

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Objective: Optimizing reproductive efficiency in terms of estrus induction and production performance using simplified hormonal intervention using GnRH, gonadotropins and progesterone at farmers field conditions to bred animals with superior quality semen and also to reduce the maintenance cost. Method: The present study was planned for optimizing reproductive efficiency using four different easily available hormonal agents with simplified protocols at farmers field. A total of 126 females were used in the study. Hormonal protocols I, II, III and IV using GnRH + (PMSG+ hCG), (PMSG+ hCG), PMSG alone and prepared progesterone gel respectively were used for estrus induction in gilts and sows. Results: The estrus induction/rate was (77.77%, 81.36%, 78.57% and 50% respectively. The corresponding figures for interval (hrs) of heat exhibition from hormonal administration (121.33&4.93, 121.54&3.60, 78.52&4.52 and 192&24), conception rate (%) (72.22%, 81.25%, 68.18% and 33.33%) farrowing rate (55.55%, 68.29%, 68.18% and 33.33 %), total litter size at birth (7.2&0.64, 7.90&0.47, 8.90&0.47 and 7.00&0) and hormonal cost (Rs.) per animal (570, 335, 280 and 250 Rs.) were respectively. The easier to use protocol was III followed by II, I and IV. Conclusion: It was found that protocol II and III are effective and easier so can be used for optimizing reproductive efficiency in pigs at farmers field.

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Section: Discussionmentioning

confidence: 99%