[Oestrus synchronization and fertility in beef cows using a prostaglandin F2 alpha analogous administered in intravulvosubmucosis]
1990
Gonzalez U, Jorge
One hundred and thirty-four beef cows and heifers were used in a work for establishing the efficacy of administration of 0,45 mg. Tiaprost via submucosaevulvae for inducing oestrus detecting breeding schemes. Animals were divided in 3 groups: Group 1: 56 heifers; Group 2: 24 heifers plus 15 cows and Group 3: 39 heifers. Every group had a different nutritional management. Tiaprost was administered after a corpus luteum detection. Heifers in group 1 were oestrus checked 3 times a day during 45 minutes each one and were inseminated with frozen semen at a present time of 80 hours of standing oestrus. Animals not in oestrus at 5 days post treatment were retreated 10-12 days after, then they were checked for oestrus and breed by a bull. Heifers and cows in group 2 were inseminated at 80 h. post treatment. Heifers in group 3 were naturally served at 12 h. of standing heat. Pregnancy was diagnosed by rectal palpation on 60-90 days post-treatment. The mean interval treatment-oestrus in group 1 was 42,5 h (8-96 h) and a 100% of response in 96 h with oestrus of 19,22 (8-36 h). Pregnancy rates were 69,9%, 33,1 (29,1 in heifers and 40% in cows) and 79,4% in groups 1, 2 and 3, respectively. Intravulvosubmucosis administration of 0,45 mgr. Tiaprost is effective in inducing oestrus in beef cattle with similar fertility compared with natural service. Fertility is higher with insemination with heat detection, natural service than fixed insemination at 80 h post treatment. Normal results were obtained comparing artificial insemination at 80 h and with heat detection and natural service in heifers synchronized with Tiaprost administered in intravulvosubmucosis
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