Search Results - "Parnell, P.F"

Comparison of two live-animal ultrasound systems for genetic evaluation of carcass traits in Angus cattle by Duff, C J, van der Werf, J H J, Parnell, P F, Clark, S A

“…Abstract The improvement of carcass traits is an important breeding objective in beef cattle breeding programs. The most common way of selecting for…”
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Optimum postweaning test for measurement of growth rate, feed intake, and feed efficiency in British breed cattle by Archer, J.A, Arthur, P.F, Herd, R.M, Parnell, P.F, Pitchford, W.S

“…The optimum duration of test for measurement of growth rate, feed intake, feed conversion, and residual feed intake was examined using postweaning feed intake…”
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Estimates of covariances between reproduction and growth in Australian beef cattle by Meyer, K. (University of New England, Armidale, NSW, Australia), Hammond, K, Mackinnon, M.J, Parnell, P.F

“…Estimates of covariance components between scrotal circumference, serving capacity, days to calving, and yearling and final weight were obtained for Hereford,…”
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Direct response to divergent selection for yearling growth rate in Angus cattle by Parnell, P.F., Arthur, P.F., Barlow, R.

“…An experiment to evaluate the effects of selection for yearling growth rate (average daily gain from birth to yearling age) on the major components of beef…”
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Correlated responses in calf body weight and size to divergent selection for yearling growth rate in Angus cattle by Arthur, P.F., Parnell, P.F., Richardson, E.C.

“…Correlated responses in calf weight and size traits resulting from 17 years (1974–1991) of divergent selection for yearling growth rate in an Angus beef cattle…”
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Effect of divergent selection for yearling growth rate on female reproductive performance in Angus cattle by Archer, J.A, Arthur, P.F, Parnell, P.F, van de Ven, R.J

“…Beef cattle are often selected for increased growth performance. There has been some concern that selection for increased growth rate may reduce reproductive…”
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Correlated responses in rate of maturation and mature size of cows and steers to divergent selection for yearling growth rate in Angus cattle by Archer, J.A, Herd, R.M, Arthur, P.F, Parnell, P.F

“…Curves were fitted to data from Angus cattle selected for high or low growth rate from birth to yearling. The data consisted of weight ( n=284) and height (…”
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