Всероссийский научно-исследовательский институт физиологии, биохимии и питания животных – филиал Федерального государственного бюджетного научного учреждения «Федеральный научный центр животноводства – ВИЖ имени академика Л.К. Эрнста»
ABSTRACT. On the indices of milk removal, it is difficult to assess dynamics of alveolar contraction during milking. Aimed to assess the functional activity of alveolus, it was previously proposed to use the indices of blood supply of the udder. The study was conducted on four cows by method of periods. In the control, the milking was carried out by conventional teat cups, in the treatment period the heated cups were used. Volume blood flow through half udder was measured using electromagnetic probes. It was established that stimulation of teats’ thermo-receptors leads to intensification of the milk removal and has a stimulating effect on the blood supply of udder. The shifts in the udder blood supply in response to stimulation of teats’ thermo-receptors are considered as a result of the increase in functional activity of alveolar complex, stemming from the reduction of the latent period of milk ejection and from the elongation of the period of alveolus functional activity. Stimulation of the teats’ thermo-receptors did not affect the duration of the alveolus contraction and duration of milk movement into cisternal department of the udder. The elongation of the period of alveolus functional activity, stemming from stimulation of teats’ thermo-receptors, was caused by the elongation of alveolus expansion phase. It is assumed that stimulation of teats’ thermo-receptors during milking causes activation of both neural and hormonal components of milk ejection reflex. A more intense movement of alveolar milk into cisternal part of the udder and weakened tonus of teat’s sphincter under stimulation of teats’ thermo-receptors contribute to intensification of milk removal rate.
REFERENCES
1. Dzidic A., Macuhova J., Bruckmaier R.M. Effects of cleaning duration and water temperature on oxytocin release and milk removal in an automatic milking system. J. Dairy Sci., 2004, 87(12): 4163-4169.
2. Frommholdt W. Untersuchungen zum Einfluβ von Druck- und Temperaturreizen auf Geschwindigkeit und Vollständigkeit des maschinellen Milchenzuges. Tierzucht, 1973, 27(2): 76-78.
3. Hoffmann H-W., Heinze A. Untersuchungen zur Stimulationswirkung von Wärmereizen beim Melken von Kühen unter Anwendung erwärmter Einraummelkbecher. Mh. Vet.-Med., 1979, 34: 130-133.
4. Kelpis E. A., Gavrish R. I. Tezisy dokladov V vsesoyuznogo simpoziuma po mashinnomu doeniyu s.-kh. zhivotnykh (Abstr. Proc. 5th Russian symposium on machine milking of farm animals). Riga, 1979, 1: 26-27.
5. Kokorina E.P. Sel'skokhosyaistvennaya biologiya - Agricultural Biology, 1979, 3: 372-380.
6. Kuznetsov E.I. Tezisy dokladov IX mezhdunarodnyi simpozium po mashinnomu doeniya s.-kh. zhivotnykh (Abstr. Proc. 9th Intern. symposium on machine milking of farm animals). Orenburg, 1997: 198-199.
7. Lyubimov V. E. Tezisy dokladov VII simpoziuma po mashinnomu doeniya s-kh zhivotnykh (Abstr. Proc. 7th Russian symposium on machine milking of farm animals). Moscow-Leningrad, 1988: 45-46.
8. Lyubin N.A. Byulleten' VNIIFBiP - Bull. Inst. Physiol. Biochem. Nutr. Farm Anim., 1987, 3: 38-42.
9. Lyubin N.A., Nazarov A.V., Tverskoi G.B. Byulleten' VNIIFBiP - Bull. Inst. Physiol. Biochem. Nutr. Farm Anim., 1987, 1: 51-56.
10. Meshcheryakov V.P., Shevelev N.S. Sel'skokhosyaistvennaya biologiya - Agricultural Biology, 2010, 6: 122-126.
11. Meshcheryakov V.P. Izvestiya TSKHA – Bulletin of Timiryazev Agricultural Academy, 2011, 2: 153-160.
12. Meshcheryakov V.P. Izvestiya TSKHA – Bulletin of Timiryazev Agricultural Academy, 2013a, 3: 89-101.
13. Meshcheryakov V.P., Izvestiya TSKHA – Bulletin of Timiryazev Agricultural Academy, 2013, 5: 115-124.
14. Petrusha A.E. Tezisy dokladov VIII simpoziuma po mashinnomu doeniyu s.-kh. zhivotnykh (Abstr. Proc. 8th Russian symposium on machine milking of farm animals). Orenburg, 1995: 110-111.
15. Phillips D.S.M. Studies on pre-milking preparation. 4. Estimation of the pre-milking stimulus requirement of cows. New Zealand Journal of Аgricultural Research, 1984, 27(4): 495-499.
16. Tretevich V.I. Molochnoe I myasnoe skotovodstvo - Dairy and Meat Cattle Breeding, 1988, 2: 47-48.
17. Tverskoi G.B., Zhestokanov O.P., Meshcheryakov V.P. Byulleten' VNIIFBiP - Bull. Inst. Physiol. Biochem. Nutr. Farm Anim., 1988, 4: 19-23.
18. Val'dman E.K. Fiziologiya mashinnogo doeniya korov (Physiology of machine milking of cows). Leningrad: Kolos, 1977, 99 p.
19. Whittlestone W.G. Stimulation and milk production. Milchwissenschaft, 1980а, 35(5): 266-270.
20. Whittlestone W.G. Stimulation und Mechanisierung des Melkens. Monatshefte fur Veterinarmedizin, 1980б, 35(23): 898-901.
21. Zaks M.G. Fiziologiya dvigatel'nogo apparata molochnoi zhelezy sel'skokhozyaistvennykh zhivotnykh (Physiology of mammary motor apparatus in farm animals). Moscow-Leningrad, 1958, 66 p.
22. Zhestokanov O.P., Lyubin N.A., Lapikov S.G. Tezisy dokladov VI vsesoyuznogo simpoziuma po mashinnomu doeniyu s.-kh. zhivotnykh (Abstr. Proc. 6th Russian symposium on machine milking of farm animals). Moscow, 1983, 1: 30-32.