Fertility associated antigen in peripubertal beef bulls as an indicator of potential fertility

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Title: Fertility associated antigen in peripubertal beef bulls as an indicator of potential fertility
Author: Gallino, Joanna Lynn
Abstract: Ejaculates from peripubertal Angus (n=106 ) , Brahman (n=156 ) and Brangus (n=212 ) bulls were evaluated for the presence of a 31 kDa protein known as fertility associated antigen (FAA ) using the ReproTest for Bulls (ReproTech , Tucson , AZ ) . This study was designed to test the repeatability of FAA detection using the chute -side cassette and to quantify the relationship of age , scrotal circumference , sperm motility , ejaculate volume and sperm concentration with the presence of FAA in ejaculates from peripubertal bulls . A total of 776 ejaculates were collected , and 77 % (n=598 ) were classified as FAA+ . Three ejaculates were obtained from 133 bulls (Angus , n=33 ; Brahman , n=100 ) on d 0 , 30 and 60 . Brahman bulls were older (p <0 .0001 ) at puberty than Angus bulls . Ejaculate volume was the only trait that differed between bulls that were classified as FAA+ and FAA ? at first collection . Mean ejaculate volume was greater (p <0 .0001 ) for FAA ? than for FAA+ ejaculates . Serial ejaculates were profiled according to one of four FAA classification patterns (0 = three FAA ? ejaculates ; 1 = three FAA+ ejaculates ; 2 = first ejaculate FAA ? ; and 3 = first ejaculate FAA+ ) . A majority of the bulls were FAA+ on all three ejaculates (57 % ) or at least on the first ejaculate (25 % ) . Seven bulls (5 % ) were consistently FAA ? , while the remaining bulls (12 % ) were FAA ? on the first ejaculate . There were no differences in scrotal circumference or sperm concentration among FAA profiles . FAA profile -3 bulls were older (p <0 .05 ) than FAA profile -1 bulls at 2nd collection . Sperm motility was greater (p <0 .05 ) for FAA profile -1 than for FAA profile -3 bulls at 1st collection . Ejaculate volume was greater (p <0 .05 ) in FAA profile -0 Angus bulls than for FAA profile -1 at 1st collection and in FAA profile -0 Brahman bulls than FAA profile -2 at 2nd collection . These data indicate that FAA classification was not affected by sperm motility , sperm concentration or scrotal circumference in peripubertal bulls . Repeatability of FAA classification was higher for bulls that were FAA+ at first ejaculation . Thus , peripubertal FAA ? bulls should be re -evaluated to increase FAA -classification accuracy for identification of higher fertility as well as lower fertility animals prior to breeding .
URI: http : / /hdl .handle .net /1969 .1 /2690
Date: 2005-11-01

Citation

Fertility associated antigen in peripubertal beef bulls as an indicator of potential fertility. Available electronically from http : / /hdl .handle .net /1969 .1 /2690 .

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