| Hormones, metabolites, and reproduction in Holsteins, Jerseys, and their crosses. | |
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MedLine Citation:
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PMID: 22281334 Owner: NLM Status: In-Data-Review |
Abstract/OtherAbstract:
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Holsteins (HH), Jerseys (JJ), and their crosses in first (n=157) and second (n=107) lactation were used to determine if reproduction, progesterone (P4), insulin-like growth factor 1 (IGF-1), insulin, nonesterified fatty acids (NEFA), and milk production differed between genetic groups. Thirty-four cows were Holstein-Jersey (HJ) crosses, 46 were Jersey-Holstein (JH) crosses, 48 were purebred Holsteins (HH), and 29 were purebred Jerseys (JJ) in first lactation, whereas the second-lactation animals included 23 HJ, 35 JH, 35 HH, and 14 JJ. Blood samples were collected weekly for the first 10 wk postpartum. Analyses were conducted using the MIXED, chi-square, and GLIMMIX procedures (SAS Institute Inc., Cary, NC). Seasons of calving were cold (November to May) and hot (June to October) and were combined with year to form 8 year-seasons. Days open and number of services were affected by genetic group. The HH were open 169±8 d, which was greater than HJ (143±9 d), JJ (132±10 d), and JH (127±8 d). The HH had 2.4±0.1 services per pregnancy, which was greater than JH (1.9±0.1), but not different from HJ (2.1±0.2) or JJ (2.1±0.2). Concentrations of NEFA were greater in lactation 2 (0.52±0.02mEq/L) than in lactation 1 (0.45±0.02mEq/L) and decreased over the 10-wk period. Concentrations of NEFA were greater in the cold season except in yr 3. Insulin in lactation 1 (0.81±0.03ng/mL) was greater than in lactation 2 (0.72±0.03ng/mL); insulin decreased to wk 2 then gradually increased. The HJ had the greatest insulin concentrations (0.87±0.04ng/mL) and the JJ had the lowest (0.66±0.04ng/mL), and IGF-1 gradually increased over the 10-wk period. Milk production (actual yield in the first 305 d, not adjusted for fat and protein) was affected by genetic group, lactation number, year-season, and wk 1 insulin. The HH produced 10,348±207kg of milk, which was greater than the HJ (9,129±230kg), the JH (9,384±190kg), and the JJ (7,080±240kg). Milk production in lactation 2 (9,676±163kg) was greater than that in lactation 1 (8,294±160kg). The JJ (10.3±4.7%) had the highest frequency of mastitis. The chance of getting mastitis for HH (1.1±0.9%) differed from that for HJ (9.4±4.1%), JH (8.1±3.4%), and JJ (10.3±4.7%). Genetic group affected hormones and metabolites, which may partially explain differences in reproductive measures and milk yield. |
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Authors:
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K L Brown; B G Cassell; M L McGilliard; M D Hanigan; F C Gwazdauskas |
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Publication Detail:
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Type: Journal Article |
Journal Detail:
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Title: Journal of dairy science Volume: 95 ISSN: 1525-3198 ISO Abbreviation: J. Dairy Sci. Publication Date: 2012 Feb |
Date Detail:
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Created Date: 2012-01-27 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
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Languages: eng Pagination: 698-707 Citation Subset: IM |
Copyright Information:
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Copyright © 2012 American Dairy Science Association. Published by Elsevier Inc. All rights reserved. |
Affiliation:
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Department of Dairy Science, Virginia Polytechnic Institute and State University, Blacksburg 24061-0315. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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