کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
10979782 | 1108065 | 2012 | 6 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Short communication: Jersey à Holstein crossbreds compared with pure Holsteins for body weight, body condition score, fertility, and survival during the first three lactations
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موضوعات مرتبط
علوم زیستی و بیوفناوری
علوم کشاورزی و بیولوژیک
علوم دامی و جانورشناسی
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چکیده انگلیسی
Crossbred cows (n = 80) resulting from the use of Jersey (JE) semen on their pure Holstein (HO) dams were compared with pure HO cows (n = 77) for body weight, body condition score, fertility, and survival during their first 3 lactations. Cows were in 2 research herds of the University of Minnesota and calved from September 2003 to June 2008. The JE à HO crossbred cows had significantly less body weight during the first (â56 kg), second (â67 kg), and third (â82 kg) lactations than pure HO cows. However, JE à HO cows had significantly greater body condition score during the first (2.94 vs. 2.84), second (2.97 vs. 2.84), and third (2.99 vs. 2.87) lactations than pure HO cows. For fertility, JE à HO cows had fewer days to first breeding during the first (â10.6 d), second (â8.4 d), and third (â12.3 d) lactations than pure HO cows. Crossbred cows were not significantly different from pure HO cows for number of services during first lactation; however, JE à HO cows had significantly fewer services (2.2) than pure HO cows (2.7) during the second lactation. Also, JE à HO cows had significantly fewer days open than pure HO cows in the first (â24 d), second (â42 d), and third (â42 d) lactations. For survival, JE à HO cows were not significantly different from pure HO cows for percentage of cows calving a second time; however, a tendency existed for a higher percentage of JE à HO cows (63.8%) than pure HO cows (49.4%) to calve a third time, and a higher percentage of JE à HO cows calved a third time within 28, 34, and 40 mo of first calving than pure HO cows.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Dairy Science - Volume 95, Issue 7, July 2012, Pages 4130-4135
Journal: Journal of Dairy Science - Volume 95, Issue 7, July 2012, Pages 4130-4135
نویسندگان
B.J. Heins, L.B. Hansen, A.R. Hazel, A.J. Seykora, D.G. Johnson, J.G. Linn,