1Instituto Tecnológico de Sonora, 5 de Febrero 818 Sur, Ciudad Obregón, Sonora, Mexico
2Universidad Autónoma de Baja California, Boulevard Delta s / n, Ejido Nuevo León, Valle de Mexicali, Baja California, Mexico
3Universidad Autónoma de Baja California Sur, Carretera al Sur, Apdo. Postal 19-B, La Paz, Baja California Sur, Mexico
4Universidad Nacional Autónoma de Mexico, Ciudad Universitaria, Del. Coyoacán, Mexico
Receive Date: 07 May 2014,
Revise Date: 20 June 2014,
Accept Date: 30 June 2014
The aim of this study was to evaluate the effect of replacing progesterone injections by progesterone vaginal inserts on productive and reproductive parameters of lactating cows with reproductive problems after prolonged periods of heat stress. Fifteen Holstein cows were randomly assigned to one of three treatments: 1) treated with two progesterone vaginal inserts (P4-INS); 2) treated with progesterone and estradiol via injections (P4-INJ) and 3) control, cows with gestation and parturition normally. All cows were subjected to a Presynch-Co-Synch timed artificial insemination protocol and then inseminated at 71 d in milk. Concentration of P4 in (P4-INS) and (P4-INJ) cows during the first 7 d of induction of lactation was similar (P>0.05) and then increased linearly in both groups. Adjusted milk yield, total milk yield, and average daily milk yield were similar (P>0.05) in treated cows, but cows from (P4-INJ) group produced less milk (P<0.05) than control cows. Days in milk and peak milk yield were similar (P>0.05) among all groups. Percentage of milk fat and protein, as well as days to peak milk yield were higher (P<0.05) in both treated groups compared to control. Body condition score, service per conception, conception to first service, total conception, days open and culling rate at the end of lactation were similar (P>0.05) among treatments. Progesterone administration by injection or by vaginal insertion resulted in similar production and reproduction parameters of dairy cattle with induced lactation.
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