REPRODUCTIVE CHARACTERISTICS OF BUFFALOES RAISED IN FLOODPLAIN AND MAIN LAND IN PARÁ STATE. I. AGE AT FIRST CALVING, INTER CALVING INTERVAL, CALVING SEASON, REPRODUCTIVE EFFICIENCY AND PREGNANCY RATES.

• Autor(a) principal: Rolim Filho, Sebastião Tavares
• Data de Publicação: 2009
• Outros Autores: Ribeiro, Haroldo Francisco Lobato, Vale, William Gomes, Picanço, Nayma da Silva, Barbosa, Elizabeth Machado, Ferreira, Rafaela Nunes
• Tipo de documento: Artigo
• Idioma: por
• Título da fonte: Ciência animal brasileira (Online)
• Texto Completo: https://revistas.ufg.br/vet/article/view/3422
• topic: Buffaloes production; Amazônia; Búfalos; Eficiência Reprodutiva

The objective of this work was to evaluate the reproductive efficiency of a buffaloes flock raised in a productive system of river and main land/artificial pasture in Belém County, Pará, state. Data on 770 female buffaloes in a total of 2115 parturition registers have been analyzed. From this herd 57 animals were submitted to gynecological examination and selected according to the body score condition (BSC) in a scale of (1-5) and inseminated in a program of fixed time for artificial insemination (FTAI). The animals were divided in two groups, the Group 1 (G1) with 31 animals and Group 2 (G2) with 26 animals, both synchronized by the protocol Ovsynch and inseminated in fixed time with 00:00h and 24:00h after of GnRH. The age for first parturition (AFP) for the whole herd was  39.52±7.54 months. The AFP related to the natural mating (NM), artificial insemination (AI) and fixed timed artificial insemination (FTAI), was of 39.5±6.58; 39.6±9.85 and 36.6±7.12 months, respectively. Considering the seasonal rain annual distribution, the AFP and the calving interval (CI) was 39.40±7.29 and 38.74±7.76,  17.09±4.71 and 16.54±3.74 months, for rainy and less rainy period, respectively,  with a concentration between March to August through 1974 and 2005. The overall average for CI 16.54±3.74 meses months. Moreover, according to the reproductive system employed, natural mated (NM), AI and FTAI was17.31, 18.43 and 20.79 months, respectively. The overall reproductive efficiency (RE) was of 0.67±0.13, and for the animals submitted to the NM, AI and FTAI was 0.69; 0.56; 0.63 respectively. The pregnancy rates obtained for each group, taking in account the moment or time for artificial insemination and the application of GnRH was of 25.81%(08/31) in the animals inseminated on 00:00h and of 30,77 % (08/26) in the inseminated on 24:00h.KEY WORDS: Buffaloes, calving interval, reproductive efficiency.