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Testosterone treatment of cows for use in detection of estrus

Kiser, T.E.; Britt, J.H.; Ritchie, H.D.

Journal of Animal Science 44(6): 1030-1035

1977

ISSN/ISBN: 0021-8812
PMID: 873856
DOI: 10.2527/jas1977.4461030x
Document Number: 434888
Aberdeen-Angus X Holstein-Friesian cows were given testosterone or testosterone propionate for 20 days (induction regime), followed by testosterone enanthate every 10 to 14 days (maintenance regime) to increase mounting behaviour. Induction treatments given as (1) intravaginal coils (185 cm2 exposed surface) covered with polydimethylsiloxane and impregnated with 3 to 5 g testosterone, (2) testosterone-impregnated (200 mg) polyurethane foam pessaries or (3) intramuscular injections of testosterone propionate (200 mg on alternate days) resulted in similar increases in blood serum concentrations of testosterone. Subcutaneous administration of 0.5 or 1 g testosterone enanthate caused prolonged elevation of blood testosterone concentrations during the maintenance regime. Testosterone-treated cows, fitted with marking devices, detected cows in oestrus that were not observed by the herdsman. CRs to 1st insemination were not significantly different when oestrus was detected from ink markings over the rump area or observed by the herdsman. In addition, testosterone-treated cows were as effective as surgically altered bulls for the detection of oestrus.

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