The efficacy of estrus detection and fertility following synchronization with PGF2a or synchro - mate- B in Zebu cattle

Orihuela, Agustı́n; Galina, C.S.; Duchateau, A.

doi:10.1016/0093-691x(89)90463-9

Cited by 7 publications

(2 citation statements)

References 16 publications

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“…The oestrous response of 89.5% obtained in this study is comparable to that obtained with norgestomet-oestradiol in other studies performed on B indicus and B taurus cattle (Orihuela et al 1989;Odde 1990;McGowan et a1 1992) and reflects the effectiveness of the treatment for synchronising behavioural oestrus in these species. The effectiveness of norgestomet-oestradiol for inducing behavioural oestrus in cows, probably results from the combined effect of progestogen priming of the brain (Orihuela et a1 1989) and the direct effect on the hypothalamus of both the exogenously administered oestrogen and the high endogenous concentrations of oestrogen, that occur in association with the use of norgestomet-oestradiol (Kojima et al1992).…”

Section: Discussionsupporting

confidence: 88%

Oestrus detection techniques and insemination strategies in Bos indicus heifers synchronised with norgestomet‐oestradiol

Cavalieri

1995

Aust Veterinary J

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Oestrus was synchronised in 57 Bos indicus heifers using norgestomet-oestradiol and pregnant mare serum gonadotrophin. Oestrus was detected by observations made at six-hourly intervals, using oestrogen-treated and chin-ball harnessed steers, heatmount detectors, tail-paint and visual observation. Heifers were inseminated once at either a fixed time of 49.2 +/- 0.4 h (mean +/- SE; n = 29) after implant removal or 12.6 +/- 1.5 h (n = 28) after oestrus was detected. The mean (+/- SE) time to the onset of oestrus was 47.1 +/- 1.9 h, while 90% of heifers recorded in oestrus were detected within 66 h of implant removal. Heatmount detectors were significantly more efficient at detecting oestrus than chin-ball harnessed steers, tail paint or visual observation (P < 0.001). A higher pregnancy rate was obtained in heifers inseminated after oestrus detection compared with heifers inseminated at a fixed-time (57.1 vs 34.5%; P = 0.043) and a higher pregnancy rate was obtained in heifers classified as easy to inseminate compared with heifers classified as difficult to inseminate (57.8 vs 0%, P < 0.001). We conclude that heatmount detectors are an efficient means of detecting oestrus in synchronised B indicus heifers and that pregnancy rates can be increased when insemination follows oestrus detection compared with a fixed-time insemination regimen.

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Section: Discussionsupporting

confidence: 88%

Oestrus detection techniques and insemination strategies in Bos indicus heifers synchronised with norgestomet‐oestradiol

Cavalieri

1995

Aust Veterinary J

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“…The onset of oestrus in Group A and ovulation in both groups (A and B), agree with earlier reports (Orihuela et al, 1989). However, onset of o e s t r u s i n Group B occurred earlier t h a n previously reported, suggesting that behavioural factors, such as social interactions in the herd, aye capable of overriding physiological conditions.…”

Section: Resultssupporting

confidence: 91%

Zebu Cows in Oestrus May Hasten Sexual Behaviour and Ovulation in Herd Mates

Isidro

Orihuela

Galina

et al. 2005

Journal of Applied Animal Research

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The influence of behavioural oestrus on the manifestation of oestrus and ovulation of herd mates was studied by ultrasonographical examination (US) of ovarian activity, Ten non-pregnant animals divided into two groups (A and B) were treated with a 9-day implant of Synchromate B (SMB) with nine days of difference between treated groups. Seven pregnant cows (Grimp C) remained within the herd to keep the social structure intact. Animals were observed continuously for 100 h after implant withdrawal. Three sexually active groups (SAG) on three different dates were recorded; each formed by cows from groups A, B and even C. Sixty percent (31 5) ovulated in the 2nd SAG and 83% (51 6) in the 3rd. It may be concluded that: 1) Cows may display mounting behaviour without apparent follicular support even with a SMB implant in place and 2) Cows induced into oestrus may hasten behavioural activity and ovulation in non-treated herd mates.

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