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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
18/09/2017 |
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Data da última atualização: |
18/09/2017 |
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Autoria: |
MEYER, J. H.; LOFGREEN, G. P.; HULL, J. L. |
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Título: |
Selective grazing by sheep and cattle. |
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Ano de publicação: |
1957 |
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Fonte/Imprenta: |
Journal of Animal Science, v. 16, n. 4, p. 766-772, Nov. 1957. |
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DOI: |
10.2527/jas1957.164766x |
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Idioma: |
Inglês |
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Conteúdo: |
Studies were made of differences in ability of sheep and cattle to graze selectively alfalfa and trefoil-orchard grass forage. Criteria used to assess the importance of selective grazing were digestibility, forage consumption, total digestible nutrient consumption, weight gains, yields of dry matter and yields of total digestible nutrients. Differences between sheep and cattle were apparent when given alfalfa forage. The sheep selected and consumed from the alfalfa pasture a forage higher in total digestible nutrients and made more gain per unit of total digestible nutrients consumed than did the steers. With the trefoil-orchard grass, however, difference between sheep and cattle in ability to select were not as apparent. It appears that with a low dense forage selective grazing will not have as great an influence as it has with a tall, less dense forage. The steers made better use of the alfalfa soilage because they consumed more feed. The sheep were unable to select the forage desired and this seemed to interfere with feed consumption and hence production. Selective grazing which resulted in refusals to eat the coarse alfalfa stems combined with higher total digestible nutrient content of trefoil-orchard grass forage decreased the importance of differences in dry matter yield between alfalfa and trefoil-orchard grass forage. Even though trefoil-orchard grass produced 58 to 63% the amount of dry matter produced by alfalfa, the ultimate yield in terms of beef and lamb produced per acre showed that trefoil-orchard grass yielded 80 and 89% respectively the yield from alfalfa. MenosStudies were made of differences in ability of sheep and cattle to graze selectively alfalfa and trefoil-orchard grass forage. Criteria used to assess the importance of selective grazing were digestibility, forage consumption, total digestible nutrient consumption, weight gains, yields of dry matter and yields of total digestible nutrients. Differences between sheep and cattle were apparent when given alfalfa forage. The sheep selected and consumed from the alfalfa pasture a forage higher in total digestible nutrients and made more gain per unit of total digestible nutrients consumed than did the steers. With the trefoil-orchard grass, however, difference between sheep and cattle in ability to select were not as apparent. It appears that with a low dense forage selective grazing will not have as great an influence as it has with a tall, less dense forage. The steers made better use of the alfalfa soilage because they consumed more feed. The sheep were unable to select the forage desired and this seemed to interfere with feed consumption and hence production. Selective grazing which resulted in refusals to eat the coarse alfalfa stems combined with higher total digestible nutrient content of trefoil-orchard grass forage decreased the importance of differences in dry matter yield between alfalfa and trefoil-orchard grass forage. Even though trefoil-orchard grass produced 58 to 63% the amount of dry matter produced by alfalfa, the ultimate yield in terms of beef and lamb produc... Mostrar Tudo |
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Palavras-Chave: |
Pasture feeding; Selective grazing. |
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Thesagro: |
Medicago Sativa; Trifolium. |
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Thesaurus Nal: |
Cattle; Grazing; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02221naa a2200241 a 4500
001 2075745
005 2017-09-18
008 1957 bl uuuu u00u1 u #d
024 7 $a10.2527/jas1957.164766x$2DOI
100 1 $aMEYER, J. H.
245 $aSelective grazing by sheep and cattle.
260 $c1957
520 $aStudies were made of differences in ability of sheep and cattle to graze selectively alfalfa and trefoil-orchard grass forage. Criteria used to assess the importance of selective grazing were digestibility, forage consumption, total digestible nutrient consumption, weight gains, yields of dry matter and yields of total digestible nutrients. Differences between sheep and cattle were apparent when given alfalfa forage. The sheep selected and consumed from the alfalfa pasture a forage higher in total digestible nutrients and made more gain per unit of total digestible nutrients consumed than did the steers. With the trefoil-orchard grass, however, difference between sheep and cattle in ability to select were not as apparent. It appears that with a low dense forage selective grazing will not have as great an influence as it has with a tall, less dense forage. The steers made better use of the alfalfa soilage because they consumed more feed. The sheep were unable to select the forage desired and this seemed to interfere with feed consumption and hence production. Selective grazing which resulted in refusals to eat the coarse alfalfa stems combined with higher total digestible nutrient content of trefoil-orchard grass forage decreased the importance of differences in dry matter yield between alfalfa and trefoil-orchard grass forage. Even though trefoil-orchard grass produced 58 to 63% the amount of dry matter produced by alfalfa, the ultimate yield in terms of beef and lamb produced per acre showed that trefoil-orchard grass yielded 80 and 89% respectively the yield from alfalfa.
650 $aCattle
650 $aGrazing
650 $aSheep
650 $aMedicago Sativa
650 $aTrifolium
653 $aPasture feeding
653 $aSelective grazing
700 1 $aLOFGREEN, G. P.
700 1 $aHULL, J. L.
773 $tJournal of Animal Science$gv. 16, n. 4, p. 766-772, Nov. 1957.
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Registro original: |
Embrapa Caprinos e Ovinos (CNPC) |
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Registro Completo
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
17/09/1998 |
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Data da última atualização: |
08/09/2021 |
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Tipo da produção científica: |
Resumo em Anais de Congresso |
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Autoria: |
ELOY, A. M. X.; RODWAY, R. G. |
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Afiliação: |
ANGELA MARIA XAVIER ELOY, CNPC. |
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Título: |
Effect of isolation stress on beta-endorphin and LH levels in ovariectomized ewes. |
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Ano de publicação: |
1994 |
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Fonte/Imprenta: |
Animal Production, v. 58, n. 3, p. 483, 1994. Abstract 220. |
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Idioma: |
Inglês |
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Notas: |
Abstract presented in the MEETING OF THE BRITISH SOCIETY OF ANIMAL PRODUCTION, 109., 1994, Scarborough. Proceedings. |
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Conteúdo: |
Abstract: The objective of this experiment was to study the effect of the psychological stress of isolation on luteinizing hormone (LH) secretion in ovariectomized ewes. Sheep were initially penned in pairs. Isolation was accomplished by removing the non-experimental sheep to another room. The trials lasted from 10.00 untii 18.00 h. ln the first stage (from 10.00 until 14.00 h) the animals were alIowed to have visual contactwith their partners, while in the second stage (14.00 until 18.00 h) the animals were isolated. Blood samples were taken at 15-min intervals throughout the experiment from jugular catheters implanted the previous day. Samples were analysed for glucose, (Betha-endorphin and LH. The isolation stress caused a significant (P < 0.05) elevation of (Betha-endorphin (316 (s.e. 11-4) v. 381 (s.e. 20.7) ng/l) but did not alter significantly (P> 0.05) the mean LH levels (4.23 (s.e. 0.14) v. 3.92 (s.e. 0.13) ug/1). However LH secretion was seen to dec1ine rapidly after the onset of isolation and then to recover. When the data were analysed in 2-h time periods the LH levels were significantly (P < 0.05) reduced betwen the 2 h before (4.70 (s.e. 0.2) ug/l) and after (3.90 (s.e. 0.2) ug/l) isolation. LH pplse analysis performed using PULSAR showed that the pulse frequency and pulse amplitude were reduced after isolation (3.8 (s.e. 1.2) v. 3.3 (s.e. 1.1) pulses per 4 h) and (2.6 (s.e. 1.5) v. 1.6 (s.e. 1.0) ug/I), respectively. Glucose levels showed significant (P < 0.05) elevation (2.7 (s.e. 0.1) v. 3.2 (s.e. 0.1) nmol/1) during isolation stress. We can conclude that a psychological stress such as isolation in a species such as the sheep stimulates opioid peptides release and inhibits LH secretion. Whether these two events are causally linked remains to be clarified. MenosAbstract: The objective of this experiment was to study the effect of the psychological stress of isolation on luteinizing hormone (LH) secretion in ovariectomized ewes. Sheep were initially penned in pairs. Isolation was accomplished by removing the non-experimental sheep to another room. The trials lasted from 10.00 untii 18.00 h. ln the first stage (from 10.00 until 14.00 h) the animals were alIowed to have visual contactwith their partners, while in the second stage (14.00 until 18.00 h) the animals were isolated. Blood samples were taken at 15-min intervals throughout the experiment from jugular catheters implanted the previous day. Samples were analysed for glucose, (Betha-endorphin and LH. The isolation stress caused a significant (P < 0.05) elevation of (Betha-endorphin (316 (s.e. 11-4) v. 381 (s.e. 20.7) ng/l) but did not alter significantly (P> 0.05) the mean LH levels (4.23 (s.e. 0.14) v. 3.92 (s.e. 0.13) ug/1). However LH secretion was seen to dec1ine rapidly after the onset of isolation and then to recover. When the data were analysed in 2-h time periods the LH levels were significantly (P < 0.05) reduced betwen the 2 h before (4.70 (s.e. 0.2) ug/l) and after (3.90 (s.e. 0.2) ug/l) isolation. LH pplse analysis performed using PULSAR showed that the pulse frequency and pulse amplitude were reduced after isolation (3.8 (s.e. 1.2) v. 3.3 (s.e. 1.1) pulses per 4 h) and (2.6 (s.e. 1.5) v. 1.6 (s.e. 1.0) ug/I), respectively. Glucose levels showed significant (P < 0.05... Mostrar Tudo |
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Palavras-Chave: |
Endorfina; LH. |
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Thesagro: |
Hormônio; Ovino; Stress. |
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Thesaurus NAL: |
Endorphins; Sheep. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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URL: |
https://www.alice.cnptia.embrapa.br/alice/bitstream/doc/515008/1/RACEffectofisolation.pdf
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Marc: |
LEADER 02512nam a2200217 a 4500
001 1515008
005 2021-09-08
008 1994 bl uuuu u00u1 u #d
100 1 $aELOY, A. M. X.
245 $aEffect of isolation stress on beta-endorphin and LH levels in ovariectomized ewes.$h[electronic resource]
260 $aAnimal Production, v. 58, n. 3, p. 483, 1994. Abstract 220.$c1994
500 $aAbstract presented in the MEETING OF THE BRITISH SOCIETY OF ANIMAL PRODUCTION, 109., 1994, Scarborough. Proceedings.
520 $aAbstract: The objective of this experiment was to study the effect of the psychological stress of isolation on luteinizing hormone (LH) secretion in ovariectomized ewes. Sheep were initially penned in pairs. Isolation was accomplished by removing the non-experimental sheep to another room. The trials lasted from 10.00 untii 18.00 h. ln the first stage (from 10.00 until 14.00 h) the animals were alIowed to have visual contactwith their partners, while in the second stage (14.00 until 18.00 h) the animals were isolated. Blood samples were taken at 15-min intervals throughout the experiment from jugular catheters implanted the previous day. Samples were analysed for glucose, (Betha-endorphin and LH. The isolation stress caused a significant (P < 0.05) elevation of (Betha-endorphin (316 (s.e. 11-4) v. 381 (s.e. 20.7) ng/l) but did not alter significantly (P> 0.05) the mean LH levels (4.23 (s.e. 0.14) v. 3.92 (s.e. 0.13) ug/1). However LH secretion was seen to dec1ine rapidly after the onset of isolation and then to recover. When the data were analysed in 2-h time periods the LH levels were significantly (P < 0.05) reduced betwen the 2 h before (4.70 (s.e. 0.2) ug/l) and after (3.90 (s.e. 0.2) ug/l) isolation. LH pplse analysis performed using PULSAR showed that the pulse frequency and pulse amplitude were reduced after isolation (3.8 (s.e. 1.2) v. 3.3 (s.e. 1.1) pulses per 4 h) and (2.6 (s.e. 1.5) v. 1.6 (s.e. 1.0) ug/I), respectively. Glucose levels showed significant (P < 0.05) elevation (2.7 (s.e. 0.1) v. 3.2 (s.e. 0.1) nmol/1) during isolation stress. We can conclude that a psychological stress such as isolation in a species such as the sheep stimulates opioid peptides release and inhibits LH secretion. Whether these two events are causally linked remains to be clarified.
650 $aEndorphins
650 $aSheep
650 $aHormônio
650 $aOvino
650 $aStress
653 $aEndorfina
653 $aLH
700 1 $aRODWAY, R. G.
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