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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: |
30/06/2023 |
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Autoria: |
LINZELL, J. L. |
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Título: |
The effect of very frequent milking and oxytocin on the yield and composition of milk in fed and fasted goats. |
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Ano de publicação: |
1967 |
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Fonte/Imprenta: |
Journal of Physiology, v. 190, n. 2, p. 333-346, 1967. |
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Idioma: |
Inglês |
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Conteúdo: |
Abstract: 1. The effect of milking goats 1-4 times an hour for 3-12 hr on the yield and composition of milk has been studied in fed and fasted animals at all stages of lactation.2. It was essential to inject oxytocin (50-400 m-u. I.V.) just before each milking to remove all the milk already in the udder and then the yield was similar to that obtained on twice daily milking (105 +/- 2.1 S.E.%). There were no significant differences between goats or between the two glands of one goat, even if one had been denervated by autotransplantation. However, the variation from hour to hour was 1.5 times greater than from day to day.3. The claim of Zaks (1964) and Zaks, Natochin, Sokolova, Tanasichuk & Tverskoy (1965) that milking every 15 min always produces a large rise in milk Na and a fall in K and lactose, which is characteristic of alveolar milk, is not substantiated. In high yielding goats milking gently by hand or with a cannula caused a small change in K only, but vigorous hand milking exacerbated this fall and also caused a fall in lactose and a rise in Na and Cl. Still larger changes were produced by using excessively large doses of oxytocin (2500 m-u.) when there was also a rise in citrate and total nitrogen. Hourly milking in goats fasted for 24 hr had the same effect.4. In fasted goats the milk yield fell to 90% within 8 hr and to 56 +/- 2.1% of the previous level by 24 hr. It remained at this level for a further 10-12 hr on twice daily or on hourly milking. The yields of autotransplanted glands usually fell slightly but significantly more than that of the glands in situ. In most goats mammary blood flow was halved but in all animals there were large falls in mammary uptake of glucose, acetate and amino acids and greatly increased uptake of free fatty acids. There were significant differences between fasted goats on hourly milking.5. It is concluded that, in spite of changes in milk composition, milking hourly can be a useful technique for studying milk secretion. The striking effects of a short fast in a lactating animal are emphasized. MenosAbstract: 1. The effect of milking goats 1-4 times an hour for 3-12 hr on the yield and composition of milk has been studied in fed and fasted animals at all stages of lactation.2. It was essential to inject oxytocin (50-400 m-u. I.V.) just before each milking to remove all the milk already in the udder and then the yield was similar to that obtained on twice daily milking (105 +/- 2.1 S.E.%). There were no significant differences between goats or between the two glands of one goat, even if one had been denervated by autotransplantation. However, the variation from hour to hour was 1.5 times greater than from day to day.3. The claim of Zaks (1964) and Zaks, Natochin, Sokolova, Tanasichuk & Tverskoy (1965) that milking every 15 min always produces a large rise in milk Na and a fall in K and lactose, which is characteristic of alveolar milk, is not substantiated. In high yielding goats milking gently by hand or with a cannula caused a small change in K only, but vigorous hand milking exacerbated this fall and also caused a fall in lactose and a rise in Na and Cl. Still larger changes were produced by using excessively large doses of oxytocin (2500 m-u.) when there was also a rise in citrate and total nitrogen. Hourly milking in goats fasted for 24 hr had the same effect.4. In fasted goats the milk yield fell to 90% within 8 hr and to 56 +/- 2.1% of the previous level by 24 hr. It remained at this level for a further 10-12 hr on twice daily or on hourly milking. The yields of a... Mostrar Tudo |
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Palavras-Chave: |
Carbon Isotopes; Triglycerides. |
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Thesagro: |
Caprino; Fisiologia; Glândula Mamaria; Reprodução. |
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Thesaurus Nal: |
Goats; Mammary glands; Milk analysis; Oxytocin; Pharmacology; Physiology; Pregnancy; Reproduction. |
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Categoria do assunto: |
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Marc: |
LEADER 02881naa a2200289 a 4500
001 1522933
005 2023-06-30
008 1967 bl uuuu u00u1 u #d
100 1 $aLINZELL, J. L.
245 $aThe effect of very frequent milking and oxytocin on the yield and composition of milk in fed and fasted goats.$h[electronic resource]
260 $c1967
520 $aAbstract: 1. The effect of milking goats 1-4 times an hour for 3-12 hr on the yield and composition of milk has been studied in fed and fasted animals at all stages of lactation.2. It was essential to inject oxytocin (50-400 m-u. I.V.) just before each milking to remove all the milk already in the udder and then the yield was similar to that obtained on twice daily milking (105 +/- 2.1 S.E.%). There were no significant differences between goats or between the two glands of one goat, even if one had been denervated by autotransplantation. However, the variation from hour to hour was 1.5 times greater than from day to day.3. The claim of Zaks (1964) and Zaks, Natochin, Sokolova, Tanasichuk & Tverskoy (1965) that milking every 15 min always produces a large rise in milk Na and a fall in K and lactose, which is characteristic of alveolar milk, is not substantiated. In high yielding goats milking gently by hand or with a cannula caused a small change in K only, but vigorous hand milking exacerbated this fall and also caused a fall in lactose and a rise in Na and Cl. Still larger changes were produced by using excessively large doses of oxytocin (2500 m-u.) when there was also a rise in citrate and total nitrogen. Hourly milking in goats fasted for 24 hr had the same effect.4. In fasted goats the milk yield fell to 90% within 8 hr and to 56 +/- 2.1% of the previous level by 24 hr. It remained at this level for a further 10-12 hr on twice daily or on hourly milking. The yields of autotransplanted glands usually fell slightly but significantly more than that of the glands in situ. In most goats mammary blood flow was halved but in all animals there were large falls in mammary uptake of glucose, acetate and amino acids and greatly increased uptake of free fatty acids. There were significant differences between fasted goats on hourly milking.5. It is concluded that, in spite of changes in milk composition, milking hourly can be a useful technique for studying milk secretion. The striking effects of a short fast in a lactating animal are emphasized.
650 $aGoats
650 $aMammary glands
650 $aMilk analysis
650 $aOxytocin
650 $aPharmacology
650 $aPhysiology
650 $aPregnancy
650 $aReproduction
650 $aCaprino
650 $aFisiologia
650 $aGlândula Mamaria
650 $aReprodução
653 $aCarbon Isotopes
653 $aTriglycerides
773 $tJournal of Physiology$gv. 190, n. 2, p. 333-346, 1967.
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| 1. |  | PAIXÃO, J. A. da; ARAÚJO NETO, J. F. de; NASCIMENTO, B. O. do; COSTA, D. M. da; BRANDÃO, H. N.; SOUZA, F. V. D.; SOUZA, E. H. de; ALVES, Q. L.; ERLING, S. B. L.; DAVID, J. P. de L. Phharmacological actions of ananas comosus l. merril: revision of the works published from 1966 to 2020. Pharmacognosy Reviews, v. 15, Issue 29, Jan./Jun., 2021.| Tipo: Artigo em Periódico Indexado | Circulação/Nível: A - 2 |
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