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R. Churchward (1965)
SOME OBSERVATIONS ON REPRODUCTIVE PERFORMANCE OF BEEF CATTLE IN NORTH WEST QUEENSLANDAustralian Veterinary Journal, 41
L. Donaldson (1962)
SOME OBSERVATIONS ON THE FERTILITY OF BEEF CATTLE IN NORTH QUEENSLANDAustralian Veterinary Journal, 38
M. Koger, W. Reynolds, W. Kirk, F. Peacock, A. Warnick (1962)
Reproductive Performance of Crossbred and Straightbred Cattle on Different Pasture Programs in FloridaJournal of Animal Science, 21
L. Donaldson, J. Ritson, D. Copeman (1967)
The reproductive efficiency of several north Queensland beef herds. 1. Physiological and management factors and embryonic neonatal losses.Australian veterinary journal, 43 1
H. Osborne (1960)
THE INVESTIGATION OF INFERTILITY SYNDROMES IN BEEF HERDSAustralian Veterinary Journal, 36
J. Wiltbank, E. Warwick, E. Vernon, B. Priode (1961)
Factors Affecting Net Calf Crop in Beef CattleJournal of Animal Science, 20
L. Donaldson, M. Lucas, L. Johnston, J. Ritson (1967)
The reproductive efficiency of several north Queensland beef herds. 2. The influence of vibriosis, trichomoniasis and lesions of the reproductive tract.Australian veterinary journal, 43 2
Summary This paper contains observations of several sources of variation in reproductive performance on 13 herds of beef cattle in north‐eastern Australia. Nearly 15,000 cows were examined, man, on more than one occasion. Variation between herds in pregnancy rate in June or September 1964, was 44 to 75 per cent. Lactating heifers had lower pregnancy rates than lactating cows, which in turn had lower rates than non‐lactating animals. Within classes, cows in poor body condition had lower fertility than those in forward‐store or fat condition. Losses of calves between pregnancy tests and branding ranged from 6 to 40 per cent in a sample of herds. In herds where year‐to‐year data were avail‐able, the majority of cattle had one calf every two years, or two calves every three years. In one herd, cows that calved before February reared more calves than those that calved later. The main conclusion was that improved nutrition of lactating heifers and cows would be expected to increase pregnancy rates substantially.
Australian Veterinary Journal – Wiley
Published: Feb 1, 1969
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