Antral follicle count in Nelore females subjected to fixed-time artificial insemination/Contagem de foliculos antrais em femeas Nelore submetidas a inseminacao artificial em tempo fixo

• Published in: Ciência rural Vol. 45; no. 4; p. 711
• Main Authors: Rodrigues, Alexandra Soares, Oliveira, Sidnei Nunes, Loiola, Marcus Vinicius Galvao, Ferraz, Priscila Assis, Chalhoub, Marcos, Bittencourt, Rodrigo Freitas, Araujo, Endrigo Adonis Braga, Bittencourt, Thereza Cristina Borio dos Santos Calmon, Filho, Antonio de Lisboa Ribeiro
• Format: Journal Article
• Language: Portuguese
• Published: Universidade Federal de Santa Maria 01-04-2015
• Subjects: Brasil
• ISSN: 0103-8478
• DOI: 10.1590/0103-8478cr20140666

This study aimed to categorize the antral follicle count(AFC) in Nelore females and subsequently determine the effect of some reproductive parameters and body condition score (BCS) on the AFC, as well as compare conception rates among Nelore females with different categories of AFC subjected to a fixed-time artificial insemination (FTAI) protocol. For that, 596 Nelore females were submitted a FTAI protocol, D4 protocol females were determined the ovarian diameter (OVD), the presence of corpus luteum (CL) and the AFC. The inseminations were performed using cryopreserved semen. The pregnancy diagnosis was performed by ultrasonography. The females were divided according to animal category (ACT), the postpartum days(PPD), OVD, presence of CL and BCS. According to this the average of the AFC and the largest population follicular intrinsically presented by the Nelore females, it was suggested that a categorization, which was considered low AFC [less than or equal to] 32, intermediate AFC between 32 and 48 and high AFC [greater than or equal to] 48 [folliclesanimal.sup.-1]. The ACT, the PPD and the BCS did not affect AFC of the animals, however, there were differences between the mean AFC in the class with the largest OVD compared the others. The presence of CL affected the AFC animals. Regarding fertility has not been demonstrated effect of AFC on conception rates of females inseminated. The results suggest that the AFC seems to be an intrinsic characteristic remained constant regard less of the physiological status of the animal. There was a positive interrelationship between DOV and the AFC. The presence of CL affected the AFC animals. However the AFC doesn't affect reproductive performance in FTAI programs. Key words: antralfollicularpopulation, Bos taurus indicus, fertility. Objetivou-se categorizar a contagem de foliculos antrais (CFA) em femeas Nelore e posteriormente determinar o efeito de alguns parametros reprodutivos e do escore de condicao corporal (ECC) sobre a CFA, assim como, comparar a taxa de concepcao entre femeas com distintas categorias de CFA submetidas a um protocolo de inseminacao artificial em tempo fixo (IATF). Para tanto, 595 femeas Nelore foram submetidas a um protocolo para IATF; no D4 do protocolo, foi determinado o diametro ovariano (DOV), a presenca de corpo luteo (CL) e a CFA. As inseminacoes foram executadas utilizando-se semen criopreservado. O diagnostico de gestacao foi realizado por ultrassonografia. As femeas foram dividas conforme a categoria animal, dias pos-parto (DPP), DOV, presenca de CL e ECC. De acordo com a media da CFA, sugeriu-se uma categorizacao da CFA, a qual considerou baixa CFA [less than or equal to] 32, intermediaria CFA entre 32 e 48 e alta CFA [greater than or equal to] 48 foliculos/animal. A categoria animal, os DPP e o ECC nao afetaram a CFA dos animais. Entretanto, houve diferenca entre a media de CFA na classe com maior DOV em comparacao com as demais. A presenca de CL influenciou na CFA dos animais. Em relacao a fertilidade, nao foi demonstrado efeito da CFA sobre a taxa de concepcao das femeas submetidas a IATF. Os resultados encontrados sugerem que a CFA parece ser uma caracteristica intrinseca, mantendo-se constante independente do status fisiologico do animal. Houve uma inter-relacao positiva entre o DOV e CFA. A presenca de CL influenciou a CFA. No entanto, a CFA nao afeta a performance reprodutiva em programas de IATF. Palavras-chave: Bos taurus indicus, fertilidade, populacao folicular antral.