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Full-Text Articles in Animal Sciences
Estrogen Receptor-Α Populations Change With Age In Commercial Laying Hens, K.K. Hansen, R.J. Kittok, G. Sarath, C.F. Toombs, N. Caceres, M.M. Beck
Estrogen Receptor-Α Populations Change With Age In Commercial Laying Hens, K.K. Hansen, R.J. Kittok, G. Sarath, C.F. Toombs, N. Caceres, M.M. Beck
Department of Animal Science: Faculty Publications
Older hens in production lay larger but fewer eggs than younger birds, and the incidence of soft and broken shells is greater in older hens than younger. These changes are attributable at least in part to changing hormone profiles and diminished ability of the hen to transport calcium at the duodenum. In further exploration of this relationship, a study was conducted with three ages of Hy-Line W-36 birds: prelay pullets (PL; 19 wk, 0% production), peak-production hens (PP; 29 wk, ∼93% production), and late-stage hens (LS; 71 wk, ∼80% production). Hens from the PP and LS groups were palpated for …
Growth And Carcass Characteristics In Wether Lambs Of A Crossbred Dam Line, A. M. Van Heelsum, R. M. Lewis, M. H. Davies, W. Haresign
Growth And Carcass Characteristics In Wether Lambs Of A Crossbred Dam Line, A. M. Van Heelsum, R. M. Lewis, M. H. Davies, W. Haresign
Department of Animal Science: Faculty Publications
While crossing of specialized sire and dam breeds can be biologically efficient overall, a by-product is produced in the form of (crossbred) males of the dam line that are unwanted for breeding. In the UK sheep indusiru, most commercial females are first crosses between males of 'longwool' crossing sire breeds, predominantly the Biuefaced Leicester, and females of hill breeds. Genetic improvement of carcass quality in longwool breeds would benefit the surplus F1males as well asfilter through to tile terminal sire cross lambs produced by the F1ewes. As afirst step, this paper aims to describe thegrowth and …
The Ability Of The N-Alkane Technique To Estimate Intake And Diet Choice Of Sheep, R. M. Lewis, A. M. Magadlela, N. S. Jessop, G. C. Emmans
The Ability Of The N-Alkane Technique To Estimate Intake And Diet Choice Of Sheep, R. M. Lewis, A. M. Magadlela, N. S. Jessop, G. C. Emmans
Department of Animal Science: Faculty Publications
This study assessed the efficacy of the n-alkane technique to estimate intake and diet composition in animals given single foods or a choice of two. In thefirst experiment intakes of pelleted ryegrassand lucerne, given eitheralone or as a choice, were measured in lambshoused indoors in individual pens. Each of the three feeding treatments was given to 12 lambs at two degrees of maturity (0.30 and 0·45 of estimated mature sizes). The 12 lambs were constituted as three replicates of the two sexes of each of two breeds. The measured intakes werecompared with those estimated using the n-alkanes C31 andC33, found …