Short communication: Jersey × Holstein crossbreds compared with pure Holsteins for production, mastitis, and body measurements during the first 3 lactations
| Autor: | J.G. Linn, Leslie B Hansen, A. R. Hazel, Bradley J Heins, D. G. Johnson, Anthony J Seykora |
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| Rok vydání: | 2011 |
| Předmět: |
Veterinary medicine
Ice calving Cell Count Biology Crossbreed Animal science Species Specificity Lactation Genetics medicine Animals Body Size Genetic Predisposition to Disease Udder Mastitis Bovine Crosses Genetic food and beverages Milk Proteins medicine.disease Dietary Fats Mastitis Milk medicine.anatomical_structure Herd Cattle Female Animal Science and Zoology Food Science |
| Zdroj: | Journal of Dairy Science. 94:501-506 |
| ISSN: | 0022-0302 |
| DOI: | 10.3168/jds.2010-3232 |
| Popis: | Jersey (JE)×Holstein (HO) crossbred cows (n=76) were compared with pure HO cows (n=73) for 305-d milk, fat, and protein production, somatic cell score (SCS), clinical mastitis, lifetime production, and body measurements during their first 3 lactations. Cows were in 2 research herds at the University of Minnesota and calved from September 2003 to June 2008. Best prediction was used to determine actual production for 305-d lactations as well as lifetime production (to 1,220 d in the herd after first calving) from test-day observations. During first lactation, JE×HO cows and pure HO cows were not significantly different for fat plus protein production; however, JE×HO cows had significantly lower fat plus protein production during second (-25 kg) and third (-51 kg) lactation than pure HO cows. Nevertheless, JE×HO cows were not significantly different from pure HO cows for lifetime production or lifetime SCS. The JE×HO cows were not significantly different from pure HO cows for SCS and clinical mastitis during first and second lactations; however, JE×HO cows tended to have higher SCS (3.79) than pure HO cows (3.40), but significantly lower (-23.4%) clinical mastitis during third lactation. The JE×HO cows had significantly less hip height, smaller heart girth, less thurl width, and less pin width than pure HO cows during the first 3 lactations. Furthermore, JE×HO cows had significantly less udder clearance from the ground and significantly greater distance between the front teats than pure HO cows during their first 3 lactations. |
| Databáze: | OpenAIRE |
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