| Trends in reproductive performance in Southeastern Holstein and Jersey DHI herds. | |
| | |
MedLine Citation:
|
PMID: 11860117 Owner: NLM Status: MEDLINE |
Abstract/OtherAbstract:
|
Trends in average days open and services per conception from 1976 to 1999 were examined in 532 Holstein and 29 Jersey herds from 10 Southeastern states. Three-year averages for eight intervals (time) were calculated (first: 1976 to 1978; eighth: 1997 to 1999). Milk, fat, fat-corrected milk, and number of cows increased across time. Herds of both breeds had linear, quadratic, and cubic effects of time on days open and services per conception. For 1976 to 1978, respective averages of days open and services per conception were 122 +/- 2.8 d and 1.91 +/- 0.08 for Jerseys, 124 +/- 0.7 d and 1.91 +/- 0.02 for Holsteins. Days open increased nonlinearly to 152 +/- 2.8 d for Jerseys and 168 +/- 0.7 d for Holsteins by 1997 to 1999, resulting in a breed x time interaction. Services per conception also increased nonlinearly, reaching 2.94 +/- 0.04 services for both breeds in 1994 to 1996, changing only slightly after 1996. Fat-corrected milk and number of cows had small but significant effects. Five subregions (one to three states) differed in mean days open and services per conception, but changes in those measures across time among subregions were similar. Days to first service increased by 16 (Holsteins) and 18 d (Jerseys) during the last five 3-yr periods, associated with increasing days open. Estrus detection rates generally declined from 1985 to 1999, associated inversely with services per conception. Reduced reproductive performance in Southeastern dairy herds is of concern. Multiple strategies are needed to attenuate further declines. |
| | |
Authors:
|
S P Washburn; W J Silvia; C H Brown; B T McDaniel; A J McAllister |
Related Documents
:
|
16283917 - The prevalences of brachyspira spp. and lawsonia intracellularis in swedish piglet prod... 17137137 - Monthly variation of fertility and oestrus frequency in crossbred dual-purpose cows in ... 10791797 - Effect of herd environment on the genetic and phenotypic relationships among milk yield... 18053237 - Plasma concentrations of cortisol and pgf2alpha metabolite in danish sows during mating... 1625997 - Cell kinetics of melanocytes in common and dysplastic nevi and in primary and metastati... 8218467 - Female streetworker--prostitutes in glasgow: a descriptive study of their lifestyle. |
Publication Detail:
|
Type: Journal Article; Research Support, Non-U.S. Gov't |
Journal Detail:
|
Title: Journal of dairy science Volume: 85 ISSN: 0022-0302 ISO Abbreviation: J. Dairy Sci. Publication Date: 2002 Jan |
Date Detail:
|
Created Date: 2002-02-25 Completed Date: 2002-10-10 Revised Date: 2007-11-15 |
Medline Journal Info:
|
Nlm Unique ID: 2985126R Medline TA: J Dairy Sci Country: United States |
Other Details:
|
Languages: eng Pagination: 244-51 Citation Subset: IM |
Affiliation:
|
Department of Animal Science, North Carolina State University, Raleigh 27695-7621, USA. steve_washburn@ncsu.edu |
Export Citation:
|
APA/MLA Format Download EndNote Download BibTex |
| MeSH Terms | |
Descriptor/Qualifier:
|
Animals Breeding / statistics & numerical data* Cattle / physiology* Female Lactation / physiology* Linear Models Milk / chemistry, secretion Pregnancy Records as Topic Reproduction / physiology* Southeastern United States |
From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
Previous Document: Fish oil and extruded soybeans fed in combination increase conjugated linoleic acids in milk of dair...
Next Document: Efficacy of two acidified chlorite postmilking teat disinfectants with sodium dodecylbenzene sulfoni...