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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
13/09/2017 |
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Data da última atualização: |
13/09/2017 |
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Autoria: |
KINCAID, C. M.; LITTON, G. W.; HUNT, R. E. |
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Título: |
Some factors that influence the production of steers from pasture. |
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Ano de publicação: |
1945 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 4, n. 2, p. 164-173, May. 1945. |
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DOI: |
10.2527/jas1945.42164x |
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Idioma: |
Inglês |
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Conteúdo: |
A factorial design used to measure the effects of three factors (age of feeder, rate of gain during winter and method of grazing) on the gain in weight and carcass grade of steers fattened on pasture shows: That no significant difference occurred in gain between yearling and two-year-old steers, but that the latter were significantly fatter, the difference amounting to ¼ of a carcass grade. That each pound of winter gain reduced summer gain by .58 pounds and increased annual gain .42 pounds. That increasing the acreage from 1? to 3? acres per steer increased gains by 19.6 pounds for each extra acre. That no advantage in gain resulted from withholding steers from part of the pasture until July 1.
That covariance analysis was effective in adjusting variances for variation in winter gain within feeding levels. The adjusted mean squares for error were reduced by 14 and 12 per cent for summer gains and carcass grades respectively.
That individual feeding may offer a means of increasing precision in feeding trials by reducing the variance within treatments. That the factorial was more effiicient in the use of facilities and provided data which had wider application to practical conditionst han would have been the case with a series of single factor experiments. Making the same number of steers answer three questions and also the interactions between them gave information on each question only three per cent less precise than if the same steers had been used to answer one of these questions alone. MenosA factorial design used to measure the effects of three factors (age of feeder, rate of gain during winter and method of grazing) on the gain in weight and carcass grade of steers fattened on pasture shows: That no significant difference occurred in gain between yearling and two-year-old steers, but that the latter were significantly fatter, the difference amounting to ¼ of a carcass grade. That each pound of winter gain reduced summer gain by .58 pounds and increased annual gain .42 pounds. That increasing the acreage from 1? to 3? acres per steer increased gains by 19.6 pounds for each extra acre. That no advantage in gain resulted from withholding steers from part of the pasture until July 1.
That covariance analysis was effective in adjusting variances for variation in winter gain within feeding levels. The adjusted mean squares for error were reduced by 14 and 12 per cent for summer gains and carcass grades respectively.
That individual feeding may offer a means of increasing precision in feeding trials by reducing the variance within treatments. That the factorial was more effiicient in the use of facilities and provided data which had wider application to practical conditionst han would have been the case with a series of single factor experiments. Making the same number of steers answer three questions and also the interactions between them gave information on each question only three per cent less precise than if the same steers had been used to answer one of these... Mostrar Tudo |
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Thesaurus Nal: |
Bullocks; Pastures. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02021naa a2200181 a 4500
001 2075540
005 2017-09-13
008 1945 bl uuuu u00u1 u #d
024 7 $a10.2527/jas1945.42164x$2DOI
100 1 $aKINCAID, C. M.
245 $aSome factors that influence the production of steers from pasture.
260 $c1945
520 $aA factorial design used to measure the effects of three factors (age of feeder, rate of gain during winter and method of grazing) on the gain in weight and carcass grade of steers fattened on pasture shows: That no significant difference occurred in gain between yearling and two-year-old steers, but that the latter were significantly fatter, the difference amounting to ¼ of a carcass grade. That each pound of winter gain reduced summer gain by .58 pounds and increased annual gain .42 pounds. That increasing the acreage from 1? to 3? acres per steer increased gains by 19.6 pounds for each extra acre. That no advantage in gain resulted from withholding steers from part of the pasture until July 1. That covariance analysis was effective in adjusting variances for variation in winter gain within feeding levels. The adjusted mean squares for error were reduced by 14 and 12 per cent for summer gains and carcass grades respectively. That individual feeding may offer a means of increasing precision in feeding trials by reducing the variance within treatments. That the factorial was more effiicient in the use of facilities and provided data which had wider application to practical conditionst han would have been the case with a series of single factor experiments. Making the same number of steers answer three questions and also the interactions between them gave information on each question only three per cent less precise than if the same steers had been used to answer one of these questions alone.
650 $aBullocks
650 $aPastures
700 1 $aLITTON, G. W.
700 1 $aHUNT, R. E.
773 $tJournal of Animal Science$gv. 4, n. 2, p. 164-173, May. 1945.
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Embrapa Caprinos e Ovinos (CNPC) |
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