The interrelationships between milkability traits and subclinical mastitis in cows

• Autorzy: Japertiene R. , Juozaitiene V. , Kriauziene J. , Rudejeviene J. , Japertas S.
• Języki publikacji: EN

Abstrakty

EN

The investigation was conducted during 2005-2006 on 4010 dairy cows. Having performed statistical data analysis, we determined that the lowest somatic cell count (SCC) in Red and Red-White cow population was obtained when the milking time was 5-6 min., milking speed was higher than 1.5 kg/min., high milk flow was from 2.51 to 4 kg/min., and in Black-White cow population having a milking time was higher than 7 min., milking speed was from 1.01 to 2 kg/min., a high milk flow – from 2.01 to 4 kg/min. (p<0.001). In Red and Red-White cow population with subclinical mastitis, milking time was longer and milking speed was slower than in healthy cows. High milk flow values were least in healthy Black-White cow population. This determines a more equal milk flow which is desired in milking cows mechanically. Most sensitive to udder infection are 1st lactation cows which have a higher milk flow. A larger phenotype correlation coefficient in Red and Red-White cow population was between the SCC and milking time (-0.089, p<0.01) and between high milk flow (0.086, p<0.01) and milk yield (-0.071, p<0.05). However in Black-White cow population, correlation was found between SCC and milk yield (-0.117, p<0.01) and milking speed (-0.110, p<0.01). Contagious mastitis pathogens were identified in Red and Red-White cow milk samples primarily from productive cows having a milking speed of 1.01-1.5 kg/min., and in Black-White cow population having a milking speed of 1.51-2.0 kg/min.

Słowa kluczowe

EN

interrelationship; milk production; subclinical mastitis; mastitis; cow; milk trait; dairy cow; milking; animal infection; milk yield; ability; animal breed

• Wydawca: -
• Czasopismo: Polish Journal of Veterinary Sciences
• Rocznik: 2007
• Tom: 10
• Numer: 4
• Opis fizyczny: p.255-261,fig.,ref.

Twórcy

autor

Japertiene R.

• Department of Animal Breeding and Genetics, Lithuanian Veterinary Academy, Tilzjeys 18, Kaunas, LT-47181, Lithuania

autor

Juozaitiene V.

autor

Kriauziene J.

autor

Rudejeviene J.

autor

Japertas S.