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- W2061470086 abstract "Paddock-mating performance was studied in seven beef bulls which were each joined to 28 or 29 females of mixed dairy and beef breeds for 8 weeks in single-sire joining groups in paddocks ranging from 4.0 to 28 ha. Seven unmated bulls were used as control animals. The estimated weight of testicular tissue per cow joined ranged from 12 to 32 g. Liveweight and testicular size and tone were recorded prior to, during and after joining. There was no apparent effect of mating on testicular characteristics of bulls, and pre-joining testicular size of the bulls was not significantly related to the calving results of the cows.Mating activity of the bulls was detected with a chin-ball harness and by behavioural observations covering eight intervals during the joining period. During the first 21 days (cycle I) of the joining period, 81% of the cows were mated and this increased to 89% by the end of the joining period. The overall return rate was 21%, the overall calving rate was 85% and no significant differences between the seven bulls were recorded in these two parameters. The relatively high level of sexual activity during cycle I apparently had no adverse effect on the fertility of the bulls since there was an even distribution over time of the return to first service of cows mated during cycle I. Mating activity of the bulls during cycle I had no significant effect on the mean percentage of time spent grazing or lying, but time spent standing was lower (P < 0.001) during cycle I than the remainder of the joining period.General activity, expressed as km travelled per day, was measured at regular intervals during the joining period for one working bull and one heifer in each of four mating groups. Mean activity of the bulls was significantly higher (11.3 km/day) during cycle I than the remainder of joining (2.45 km/day) and was significantly correlated (r = 0.8) to the mean number of cows mated per bull per day." @default.
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- W2061470086 date "1983-12-01" @default.
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- W2061470086 title "Behaviour and mating performance of paddock-mated beef bulls" @default.
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- W2061470086 doi "https://doi.org/10.1016/0378-4320(83)90033-7" @default.
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