Role of aquaporin 3 in reproductive performance of dairy goats after repeated estrus synchronization stimulation

Sun, Shuang; Liu, Ming; Niu, Huimin; Luo, Jun

doi:10.1111/rda.14358

Cited by 1 publication

(1 citation statement)

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“…Dairy goats often undergo multiple ES treatments throughout their reproductive lifespan to enhance reproductive efficiency and economic benefits ( 11 , 12 ). Nevertheless, repeated PMSG-mediated ES treatment can seriously impair the reproductive performance ( 13 ), even with up to a 1 year interval between each treatment ( 14 ).…”

Section: Introductionmentioning

confidence: 99%

Influence of repeated estrus synchronization treatment on hormone secretion, growth, and development of dairy goats

Sun,

Lv,

Niu

et al. 2024

Front. Vet. Sci.

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In large-scale intensive farms, dairy goats often undergo frequent estrus synchronization (ES) treatment, which may result in a decline in reproductive performance; however, the underlying mechanism remains unclear. The present study aimed to investigate the effect of pregnant mare serum gonadotropin (PMSG) and progesterone (P4)-mediated ES treatment on fertility in dairy goats, while also identifying key metabolic and endocrine mechanisms that influence reproductive performance in does subjected to repeated ES treatment. Forty-eight Saanen does were randomly assigned to two groups (24 goats each) that received ES treatments either thrice fortnightly (3-PMSG) or once (1-PMSG) simultaneously with the third ES treatment of the 3-PMSG group during the breeding season. ES treatment was performed via the intravaginal insertion of a controlled internal drug release (CIDR) device impregnated with 300 mg P4, followed by 300 IU PMSG injections 48 h before CIDR withdrawal. Blood was collected to detect the level of hormones and blood biochemical indices. Additionally, estrus rate, fecundity rate, body weight, size, and lactation performance were measured. The results showed that repeated ES treatment markedly decreased the estrus rate and fecundity rate of goats. Among the does in all groups, there was no substantial difference in follicle stimulating hormone, luteinising hormone, gonadotropin-releasing hormone, melatonin, growth hormone, PMSG, total cholesterol, total protein, and glucose levels, as well as the body weight, body size, and lactation performance. Repeated ES treatment elevated estrogen (E2) levels 36, 48, and 72 h post-CIDR removal; increased P4 upon CIDR insertion; and raised PMSG antibody levels 24, 48, and 72 h post-CIDR removal. The results suggest that elevated anti-PMSG levels are the primary reason for the decline in ES efficiency, and that high E2 and P4 levels at some time points also impair reproductive performance. These findings provide novel insights into the metabolic effects of repeated PMSG stimulation in goats, guiding future reproductive hormone use in breeding practices.

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