Abstract
The period of service is the time between calving and conception, the desired average interval is 85 to 115 days, when prolonged results in losses such as decreased production and decreased number of calves in the productive life of the female bovine. The aim of this study was to demonstrate to family farmers that through Fixed Time Artificial Insemination (IATF) it is possible to reduce the period of service and consequently the interval between births, thus improving the reproductive efficiency of the herd. Ten family farms were selected in the municipality of Conceição do Araguaia, southeastern Pará, 991 km from the state capital. One hundred crossbred/multiparous cows of low production were palpated to confirm voids and at least 45 days of calving. On Day 0 (intravaginal progesterone implant and 2ml intramuscular estradiol benzoate), Day 8 (implant withdrawal plus 2.5ml prostaglandin, 1.5ml Equine Chorionic Gonadotropin and 0.5ml estradiol cipionate, intramuscular), Day 10 the insemination. The pregnancy diagnosis was made 60 days after ultrasound insemination, the empty diagnosed cows were sent to bulls with their respective farms. The conception rate was based on 94 cows, since 03 cows died and 03 were slaughtered before the pregnancy diagnosis. A conception rate of 53% (50/94) was obtained, of which 60% (30/50) were calved between 45 to 60 days, while 40% (20/50) were calved for more than 120 days. It can be concluded that the TAI reduces the period of service and consequently the interval between births, also demonstrating utility in family farming herds, which may result in a greater possibility of milk / calf production / year.
Highlights
Use of Inseminación Artificial de Tiempo Fijo (IATF) as an alternative to improve the reproductive efficiency of dairy cows Abstract
Use of IATF as an alternative to improve the reproductive efficiency of dairy cows Abstract
The period of service is the time between calving and conception, the desired average interval is 85 to 115 days, when prolonged results in losses such as decreased production and decreased number of calves in the productive life of the female bovine
Summary
O projeto foi desenvolvido durante o período de setembro/2013 a dezembro/2014, aprovado pelo Edital 07/2013 – PROPPG – IFPA. Foram selecionadas 10 propriedades da agricultura familiar, no município de Conceição do Araguaia, Pará, sudeste paraense, distante 991 km da capital do estado, onde os produtores participantes comprovaram ter experiência na atividade leiteira. Os produtores possuíam entre 20 e 30 vacas no rebanho, além de infraestrutura mínima em suas propriedades como: curral em bom estado, bom suporte forrageiro e uma produção de leite intermitente durante todo o ano. Todas as vacas eram palpadas para confirmação de vazias e com pelo menos 45 dias de paridas, sendo esta última referência baseada nas anotações encontradas em cadernos nas propriedades. O diagnóstico de gestação foi feito aos 60 dias após a inseminação com equipamento de ultrassom veterinário Mindray DP2200, pelo mesmo Médico Veterinário. As vacas diagnosticadas vazias foram encaminhadas ao repasse com touros das respectivas propriedades
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