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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
02/12/2004 |
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Data da última atualização: |
30/08/2023 |
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Autoria: |
BLAXTER, K. L.; WAINMAN, F. W.; WILSON, R. S. |
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Título: |
The regulation of food intake by sheep. |
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Ano de publicação: |
1961 |
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Fonte/Imprenta: |
Animal Production, v. 3, n. 1, p. 51-61, Feb. 1961. |
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DOI: |
https://doi.org/10.1017/S0003356100033766 |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: 1. A series of experiments with adult sheep were carried out in an attempt to place on a quantitative basis the generalisation that the voluntary food intake of ruminants increases with the quality of the fodder they are given. 2. Methods of determining voluntary intake free of subjective bias were developed. It was shown that voluntary intake varied with a fractional power of body weight close to 0·734. The length of time necessary to establish stable intakes was 12?15 days and the number of times fresh food was offered each day had no apparent effect on intake. 3. It was found that voluntary intake of long fodders was related to the apparent digestibility of their energy, increasing rapidly as digestibility increased from 38% to 70% and thereafter more slowly. 4. The giving of concentrated food resulted in a drop in the voluntary intake of fodder. With high quality hay 100 g. concentrates replaced 100 g. hay. With poor quality hay, 100 g. concentrates replaced 47 g. of hay. 5. The passage of three widely different hays through the gut was measured and the poorest passed most slowly. Calculations showed that the dry matter content of gut contents was the same for all three materials irrespective of their quality. 6. It was shown that an increase in digestibility of 10 units in the range 40?60% resulted in considerable increases in the total amount of energy apparently digested and in equivalent increases in daily gain. 7. The digested energy consumed/day/kg. W0·734 (E) can be related to voluntary intake (I) g./day/kg. W0·734 by the equation:?E=4·(I?31) which provides a rapid and easy method of assessing fodder quality under conditions of ad libitum supply.8. The results are discussed and it is shown that under ad libitum feeding conditions an increase in the nutritive value of unit feed from 50 to 55, i.e. by 10%, increases body gain by 100%. MenosAbstract: 1. A series of experiments with adult sheep were carried out in an attempt to place on a quantitative basis the generalisation that the voluntary food intake of ruminants increases with the quality of the fodder they are given. 2. Methods of determining voluntary intake free of subjective bias were developed. It was shown that voluntary intake varied with a fractional power of body weight close to 0·734. The length of time necessary to establish stable intakes was 12?15 days and the number of times fresh food was offered each day had no apparent effect on intake. 3. It was found that voluntary intake of long fodders was related to the apparent digestibility of their energy, increasing rapidly as digestibility increased from 38% to 70% and thereafter more slowly. 4. The giving of concentrated food resulted in a drop in the voluntary intake of fodder. With high quality hay 100 g. concentrates replaced 100 g. hay. With poor quality hay, 100 g. concentrates replaced 47 g. of hay. 5. The passage of three widely different hays through the gut was measured and the poorest passed most slowly. Calculations showed that the dry matter content of gut contents was the same for all three materials irrespective of their quality. 6. It was shown that an increase in digestibility of 10 units in the range 40?60% resulted in considerable increases in the total amount of energy apparently digested and in equivalent increases in daily gain. 7. The digested energy consumed/day/kg. W0·73... Mostrar Tudo |
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Thesaurus Nal: |
Ad libitum feeding; Digestibility; Feed intake; Feeds; Forage quality; Liveweight gain; Physiology; Ruminant nutrition; Sheep feeding. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02621naa a2200265 a 4500
001 1515057
005 2023-08-30
008 1961 bl uuuu u00u1 u #d
024 7 $ahttps://doi.org/10.1017/S0003356100033766$2DOI
100 1 $aBLAXTER, K. L.
245 $aThe regulation of food intake by sheep.$h[electronic resource]
260 $c1961
520 $aAbstract: 1. A series of experiments with adult sheep were carried out in an attempt to place on a quantitative basis the generalisation that the voluntary food intake of ruminants increases with the quality of the fodder they are given. 2. Methods of determining voluntary intake free of subjective bias were developed. It was shown that voluntary intake varied with a fractional power of body weight close to 0·734. The length of time necessary to establish stable intakes was 12?15 days and the number of times fresh food was offered each day had no apparent effect on intake. 3. It was found that voluntary intake of long fodders was related to the apparent digestibility of their energy, increasing rapidly as digestibility increased from 38% to 70% and thereafter more slowly. 4. The giving of concentrated food resulted in a drop in the voluntary intake of fodder. With high quality hay 100 g. concentrates replaced 100 g. hay. With poor quality hay, 100 g. concentrates replaced 47 g. of hay. 5. The passage of three widely different hays through the gut was measured and the poorest passed most slowly. Calculations showed that the dry matter content of gut contents was the same for all three materials irrespective of their quality. 6. It was shown that an increase in digestibility of 10 units in the range 40?60% resulted in considerable increases in the total amount of energy apparently digested and in equivalent increases in daily gain. 7. The digested energy consumed/day/kg. W0·734 (E) can be related to voluntary intake (I) g./day/kg. W0·734 by the equation:?E=4·(I?31) which provides a rapid and easy method of assessing fodder quality under conditions of ad libitum supply.8. The results are discussed and it is shown that under ad libitum feeding conditions an increase in the nutritive value of unit feed from 50 to 55, i.e. by 10%, increases body gain by 100%.
650 $aAd libitum feeding
650 $aDigestibility
650 $aFeed intake
650 $aFeeds
650 $aForage quality
650 $aLiveweight gain
650 $aPhysiology
650 $aRuminant nutrition
650 $aSheep feeding
700 1 $aWAINMAN, F. W.
700 1 $aWILSON, R. S.
773 $tAnimal Production$gv. 3, n. 1, p. 51-61, Feb. 1961.
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Embrapa Caprinos e Ovinos (CNPC) |
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