ON PHYSICAL AND CHEMICAL PROPERTIES OF MILK OBTAINED FROM CROSSBRED GOATS OF SAANEN BRRED UNDER THEIR KEEPING ON ANIMAL FARM OF IAB and VM OF KRASNOYARSK SAU
The purpose of the researches was to study the density, viscosity and concentration of hydrogen ions of milk of goats of crossbred Saanen breed and to com-pare with the data on the maintenance of specified indi-cators in milk of cattle published in scientific publica-tions. The researches were conducted on the zoofarm of the Institute of Applied Biotechnology and Veterinary Medicine where lactating goats were kept and also in physiological laboratory of the Chair of Internal Noncon-tagious Diseases, Obstetrics and Physiology of Farm Animals of Krasnoyarsk SAU. Feeding of goats of crossbred Saanen breed was conducted according to the standards for feed consumption while keeping lac-tating goats during stall period. The following types of hay (cereal herbs), carrots, cabbage and concentrated forages were included in it. To obtain cisternal portions of milk lactating goats were placed into a special ma- chine. The tip of the nipple was disinfected with the so- lution of furacilin and sterile catheter was injected into the nipple channel, through which cistern portion of milk leaked into substituted glass vessel, its quantity was measured. The density of the milk received from goats of crossbred Saanen breed was determined by pycnometer. For studying milk viscosity the device VK-4 viscometer was used which fixed the speed of advance of liquids in capillaries, identical to internal section, at identical temperature and pressure. The velocity de- pended on internal friction between the molecules of tested liquid, i.e. on its viscosity. The concentration of hydrogen ions was investigated by pH meter- millivoltmeter PH-410. It was established that the densi-ty of the milk received from goats of crossbred Saanen breed made 1.034±0.046 kg/m3, the viscosity was 1.8±0.0 (7 in relation to distilled water) and the concen- tration of hydrogen ions (PH) had subacidic reaction and averaged 6.25±0.20.