Optimizing the use of sex-sorted sperm in timed artificial insemination programs for suckled beef cows1

Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramusc...

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Bibliographic Details
Published in:Journal of animal science 2012-06, Vol.90 (6), p.1816-1823
Main Authors: Sá Filho, M. F., Girotto, R., Abe, E. K., Penteado, L., Campos Filho, E. P., Moreno, J. F., Sala, R. V., Nichi, M., Baruselli, P. S.
Format: Article
Language:English
Subjects:
Animal reproduction
Artificial insemination
Breeding of animals
Cattle
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Summary:Three experiments were designed to evaluate methods to optimize the use of sex-sorted sperm in timed A1 (TAI) programs for suckled beef cows. In all 3 experiments, suckled Bos indicus cows were synchronized using an intravaginal progesterone (P4) device during 8 d and a 2.0-mg injection of intramuscular estradiol benzoate (EB) at device insertion. The females received PG and eCG (300 IU) at P4 device removal and 1.0 mg of EB 24 h later. The cows were inseminated 60 to 64 h after P4 device withdrawal. All cows had their ovaries scanned by transrectal ultrasound at TAI to identify and to measure the largest follicle (LF) present. In Exp. 1, a total of 853 cows had their LF classified as
ISSN:0021-8812
1525-3163
DOI:10.2527/jas.2011-4523