Improving reproductive performance in lactating dairy cows by synchronising ovulation or inducing oestrus

Gábor, Gy. and Kastelic, J. P. and Pintér, S. and et al., (2002) Improving reproductive performance in lactating dairy cows by synchronising ovulation or inducing oestrus. Acta Veterinaria Hungarica, 50 (2). pp. 231-234. ISSN 0236-6290

Preview

Text avet.50.2002.2.12.pdf Download (114kB) | Preview

Abstract

Lactating crossbred Holstein-Friesian dairy cows (n = 331) were started on an Ovsynch regimen 68 ± 8.2 days after calving; 200 µg GnRH intramuscularly (i.m.) on Days 0 and 9, and 35 mg prostaglandin F_2a i.m. on Day 7. Thirty-eight and 31 cows (11.5 and 9.4%, respectively) were in oestrus on Days 0 to 6 and 7 to 8, respectively, and inseminated, and the remainder were fixed-time inseminated (on Day 10). For these three groups, pregnancy rates (60-65 days after breeding) were 31.6, 38.7 and 34.0%, respectively (P = 0.82) and calving rates were 100, 100 and 89.9% (P = 0.23). In a preliminary trial, twelve lactating cows (45 to 60 days postpartum) with inactive ovaries were given 1500 IU eCG i.m.; 10 were in oestrus within 10 days after treatment (and inseminated) and eight of these were pregnant (30 days after breeding). The Ovsynch program resulted in acceptable reproductive performance in cyclic cows and eCG treatment has considerable promise for inducing oestrus in anoestrous cows.

Actions (login required)

Edit Item