Effect of Lactation Yield on First Follicular Wave Surge After Calving of Crossbred Dairy Cattle
Palavras-chave:Follicle, post-partum, lactation, dairy cattle
Abstract: This study aimed Â to evaluate the effect of lactation on first follicular wave surge of crossbredÂ (Gir x Holstein) dairy cattle. Â Nine multiparous crossbred dairy cattle were divided accordingÂ to daily milk production (Group 1 = milk production higher than average, n = 5; Group 2 =Â milk Â production Â lower Â than Â average, Â n Â = Â 4). Â From Â calving Â (Day Â 0) Â until Â divergence Â of Â firstÂ follicular wave, ovaries Â was monitored daily by ultrasound exams to observed the follicularÂ emergence, Â growth Â rate, Â maximum Â follicular Â diameter, Â day Â of Â follicular Â divergence Â andÂ ovulation. The mean of milk production was 17.4 + 6.4 L/day (n= 9). Group 1 had higher dailyÂ milk production than Group 2 (21.8 + 3.8 L/day vs. 11.9 + 3.9 L/day, P< 0.001). Data of follicularÂ emergence were similar in both groups (P >0.05). The growth Â rate of first follicular surge wasÂ higher Â in Â Group Â 2 Â than Â Group Â 1 Â (2.0 Â + 0.0 Â mm/day Â vs Â 1.2 Â + 0.6 Â mm/day, Â P< Â 0.05). Â TheÂ maximum follicular diameter was 11.6 Â + 0.9 mm (Group 1) and 13.5 Â + 1.7 mm (Group 2); P<Â 0.05. The follicular divergence occurred earlier Â in Group 1 than Group 2 (12.2 Â + 0.8 days vsÂ 13.7 + 0.6 days; P< 0.05). One animal of Group 2 ovulated. In conclusion, data suggested thatÂ milk production had influence on ovarian follicular dynamic after calving.
Keywords: Follicle, post-partum, lactation, dairy cattle
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