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Registro Completo |
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Biblioteca(s): |
Embrapa Caprinos e Ovinos. |
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Data corrente: |
01/08/1992 |
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Data da última atualização: |
30/03/2023 |
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Autoria: |
LINZELL, J. L. |
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Afiliação: |
Agricultural Research Council Institute of Animal Physiology, Babraham, Cambridge. |
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Título: |
Mammary-gland blood flow and oxygen, glucose and volatile fatty acid uptake in the conscius goat. |
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Ano de publicação: |
1960 |
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Fonte/Imprenta: |
The Journal of Physiology, v. 153, n. 3, p. 492-509, Oct. 1960. |
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DOI: |
10.1113/jphysiol.1960.sp006550 |
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Idioma: |
Inglês |
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Conteúdo: |
1. Mammary-gland blood flow, weight, milk yield and arteriovenous differences of 02, Ca, glucose and volatile fatty acids have been measured at all stages of the reproductive cycle in goats trained to stand in the laboratory. 2. The mean blood flow was 28 ml./100 g/min in dry goats and 45 ml./ 100 g/min in lactating animals giving 100 ml. milk/l00 g/day. Holding goats on their sides, as was done by previous workers who recorded much lower figures, significantly reduced the mammary blood flow. 3. Blood flow variation from minute to minute was 10 % of the mean (S.D.), and was not significantly greater from hour to hour or from day to day. During lactation the blood flow varied with the milk yield. 4. The mean arteriovenous differences and instantaneous R.Q. agree well with those of previous workers. The mean ratio of blood flow to milk yield (650:1) calculated from the Ca difference and the milk Ca agrees with earlier estimates and with directly observed values, but was found to increase with a fall in milk yield and is thus a measure of efficiency. 5. During lactation 02 consumption doubles, the uptake of volatile fatty acids trebles but glucose uptake increases nine times. 6. On the average 100 % of the Ca, and 80 % of the N and calories removed from the blood appear in the milk. Similarly 80 % of the neutral fat and volatile fatty acids taken up are accounted for in milk fat but only 50 % of the glucose appears as lactose. 7. The importance of glucose in the metabolism of lactating ruminants is stressed. Menos1. Mammary-gland blood flow, weight, milk yield and arteriovenous differences of 02, Ca, glucose and volatile fatty acids have been measured at all stages of the reproductive cycle in goats trained to stand in the laboratory. 2. The mean blood flow was 28 ml./100 g/min in dry goats and 45 ml./ 100 g/min in lactating animals giving 100 ml. milk/l00 g/day. Holding goats on their sides, as was done by previous workers who recorded much lower figures, significantly reduced the mammary blood flow. 3. Blood flow variation from minute to minute was 10 % of the mean (S.D.), and was not significantly greater from hour to hour or from day to day. During lactation the blood flow varied with the milk yield. 4. The mean arteriovenous differences and instantaneous R.Q. agree well with those of previous workers. The mean ratio of blood flow to milk yield (650:1) calculated from the Ca difference and the milk Ca agrees with earlier estimates and with directly observed values, but was found to increase with a fall in milk yield and is thus a measure of efficiency. 5. During lactation 02 consumption doubles, the uptake of volatile fatty acids trebles but glucose uptake increases nine times. 6. On the average 100 % of the Ca, and 80 % of the N and calories removed from the blood appear in the milk. Similarly 80 % of the neutral fat and volatile fatty acids taken up are accounted for in milk fat but only 50 % of the glucose appears as lactose. 7. The importance of glucose in the metabolism of l... Mostrar Tudo |
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Palavras-Chave: |
Oxygen metabolism. |
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Thesagro: |
Caprino; Fisiologia; Glândula Mamaria. |
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Thesaurus Nal: |
Animal physiology; Glucose; Goats; Humans; Lipid metabolism; Mammary glands; Reproduction; Volatile fatty acids. |
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Categoria do assunto: |
L Ciência Animal e Produtos de Origem Animal |
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Marc: |
LEADER 02342naa a2200277 a 4500
001 1522338
005 2023-03-30
008 1960 bl uuuu u00u1 u #d
024 7 $a10.1113/jphysiol.1960.sp006550$2DOI
100 1 $aLINZELL, J. L.
245 $aMammary-gland blood flow and oxygen, glucose and volatile fatty acid uptake in the conscius goat.$h[electronic resource]
260 $c1960
520 $a1. Mammary-gland blood flow, weight, milk yield and arteriovenous differences of 02, Ca, glucose and volatile fatty acids have been measured at all stages of the reproductive cycle in goats trained to stand in the laboratory. 2. The mean blood flow was 28 ml./100 g/min in dry goats and 45 ml./ 100 g/min in lactating animals giving 100 ml. milk/l00 g/day. Holding goats on their sides, as was done by previous workers who recorded much lower figures, significantly reduced the mammary blood flow. 3. Blood flow variation from minute to minute was 10 % of the mean (S.D.), and was not significantly greater from hour to hour or from day to day. During lactation the blood flow varied with the milk yield. 4. The mean arteriovenous differences and instantaneous R.Q. agree well with those of previous workers. The mean ratio of blood flow to milk yield (650:1) calculated from the Ca difference and the milk Ca agrees with earlier estimates and with directly observed values, but was found to increase with a fall in milk yield and is thus a measure of efficiency. 5. During lactation 02 consumption doubles, the uptake of volatile fatty acids trebles but glucose uptake increases nine times. 6. On the average 100 % of the Ca, and 80 % of the N and calories removed from the blood appear in the milk. Similarly 80 % of the neutral fat and volatile fatty acids taken up are accounted for in milk fat but only 50 % of the glucose appears as lactose. 7. The importance of glucose in the metabolism of lactating ruminants is stressed.
650 $aAnimal physiology
650 $aGlucose
650 $aGoats
650 $aHumans
650 $aLipid metabolism
650 $aMammary glands
650 $aReproduction
650 $aVolatile fatty acids
650 $aCaprino
650 $aFisiologia
650 $aGlândula Mamaria
653 $aOxygen metabolism
773 $tThe Journal of Physiology$gv. 153, n. 3, p. 492-509, Oct. 1960.
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| 1. |  | QUEZADA, M.; PASTINA, M. M.; RAVEST, G.; SILVA, P.; VIGNALE, B.; CABRERA, D.; HINRICHSEN, P.; GARCIA, A. A. F.; PRITSCH, C. A first genetic map of Acca sellowiana based on ISSR, AFLP and SSR markers. Scientia Horticulturae, v. 169, p. 138-146, 2014.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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