Pieno kokybę apibūdina visa eilė rodyklių. Svarbiausias iš jų - somatinių ląstelių skaičius. Didėjantis SLS nurodo, kad karvė serga dažniausiai pasitaikančia ginekologine liga mastitu. Klinikiniu mastitu serga apie 1 – 2 proc. karvių. Dažniausiai serga karvės slaptuoju mastitu. Literatūros duomenys teigia, kad laktuojančių karvių bandose šiuo mastitu serga 43 – 47 proc. karvių. Svarbiausias slaptojo mastito požymis-padidėjęs somatinių ląstelių skaičius piene. Dažniausiai tešmens infekcija karvės suserga pirmaisiais laktacijos mėnesiais ir 80 proc. atvejų jos serga visą laktacijos laikotarpį. Sergant mastitu netenkama iki 25 proc. pieno per laktaciją. Vien tik dėl vieno tešmens ketvirčio uždegimo pieno per laktaciją sumažėja net iki 12 proc. Mastitu persirgusių karvių produktyvumas ne visuomet atsikuria toks, koks buvo iki ligos, nes negrįžtamai pasikeičia alveolinis audinys, tad kai kurias karves tenka išbrokuoti. Mastitą galima diagnozuoti pagal laktozės koncentracija elektrolitų sudėti ir SLS. Patogiausia ir pigiausia diagnozuoti pagal SLS. / The aim of this study was to find the non genetical influence facts in cows milk, for healthy cows and cows with secret mastitis. Scientific research work was carried out at the Department of Non-infectious diseases, Lithuanian Veterinary Academy and Practical Instruction and Research Centre LVA from 2005 to 2007. This work analyses data from dairy cow milk production. Experiments were carried out on two to seven year old black and white breed lactating cows, during the housing period. Data from 166 cows was used in this analysis. Inclusion criteria - somatic cell count higher than 400x 103/ml. We analyzed the influence of lactation on milk somatic cell count, cow age impact on productivity during lactation period on the number of somatic cells in the milk, parturition – to conception period length, season of the year. Increasing lactation number, was associated with elevated somatic cell count from 247, 3 until 392, 4 103/ml; and average milk yield per day also increased from 12,1 until 13,8 kg, milk fat increased from 4,34 until 4,38 percent, protein content increased from 3,15 to 3,30 percent. Milk lactose content decreased accordingly from 4,75 to 4,67 percent. Age positively influences milk productivity. This can be explained by lowered resistance to mastitis which is more frequent with age, cow automatic milking and supervision mistakes (Powell, et Al. 1997). According to literature data age and lactation period highly influences cow health and productivity. Age has... [to full text]

The aim of this diploma thesis is to asses the effect of various factors on the milk production and its content in regard to goat's milk in the years 2015 to 2017. The evaluation was conducted on goat farm Richmond Stars in Chotětov. The farm currently accommodates 31 goats of the white shorthaired breed. They are still opting for the one rectangular space solution. The feeds consist of bulk fodder, silage, hay and grass (pasture during summer). The feed composure is the same throughout the whole year. The water supply system consists of water containers with manual refill. The goats are divided into groups based on their age. Milking takes place twice a day. The data on milk production was processed using Microsoft Excel and Statistica. When comparing the overall milk productivity with the average of Czech Republic, there were statistically significant differences found in the fat content in the year 2016, in the protein content in years 2015, 2016 and 2017, in the lactose content in the year 2015. In all cases, the Richmond Stars farm was the one with better score. Other results were evaluated as inconclusive and therefore no statistically significant difference was found. When considering the impact of the goat's age on the milk productivity and the goat's milk content, there was a statistically conclusive impact in the productivity (milking) itself as well as in the fat content. When observing the impact of the father-line on the productivity level and the milk content, there was a statistically conclusive result only in the fat content. When evaluating the impact of the period of birth on the milk productivity and milk content, there was a statistically conclusive impact on the fat and lactose content. All other results, specifically the productivity (milking), were evaluated as inconclusive and therefore were not statistically significant for the purpose of evaluation of the milk productivity characteristics.