Document Detail


Pregnancy in slaughtered cows in North-Eastern Australia: incidence and relationship to pregnancy diagnosis, season, age and carcase weight.
MedLine Citation:
PMID:  1200929     Owner:  NLM     Status:  MEDLINE    
Abstract/OtherAbstract:
A total of 7495 postpuberal beef cows from herds in north Queensland and the Northern Territory were examined at abattoirs to define the extent of wastage due to the slaughter of pregnant cows. On the basis of examination of teeth most cows (57%) were considered mature (approximately 3.5 to 7 years) at slaughter; 14% were young (9 months to 3.5 years) and 29% were old (over 7 years). In herds where pregnancy diagnosis by rectal examination had not been used at time of culling, 71.6% of slaughtered cows were pregnant and 42% of these cows were in the second trimester. This high pregnancy rate was considered an important source of herd wastage. Pregnancy rate varied little with season, but the highest percentages of cows pregnant in the first and third trimesters were recorded in autumn and spring, respectively. Most cows found non-pregnant had active ovaries at time of slaughter. Anoestrus was observed to be most common in winter and in old cows. Lactational status was not recorded. Mean cold carcase weight of 4229 cows was 161 +/- 40 kg. Maximum carcase weight was observed in cows slaughtered at 4 to 6 years of age; old cows had the lowest carcase weight (147 +/- 31 kg) of the age groups considered. Highest (170 +/- 43 kg) and lowest (135 +/- 41 kg) carcase weights in relation to pregnancy or ovarian status were observed in non-pregnant/ovary-active and non-pregnant/anoestrus cows respectively. Carcase weight of cows in the third trimester (165 +/- 35 kg) was greater than in the second (161 +/- 35 kg) or first (157 +/- 36 kg) trimesters; difference between the first and third trimesters was significant (P less than 0.01).
Authors:
P W Ladds; P M Summers; J D Humphrey
Related Documents :
3624599 - Comparison of on-farm laboratory milk progesterone assays for identifying errors in det...
7085519 - Postpartum ovarian function and fertility in beef cattle that produce twins.
16727049 - Ultrasonic determination of fetal gender in horses and cattle under farm conditions.
7085509 - Induction of twins in different breeds of cattle.
23494199 - The success rate of pregnancy in iui cycles following endometrial sampling. a randomize...
16727949 - The effect of trypanosoma vivax infection on late pregnancy and postpartum return to cy...
11132579 - Von willebrand disease and pregnancy.
8781869 - Effects of caffeine ingestion on endurance racing in heat and humidity.
18555229 - Primary twin omental pregnancy: report of a rare case and literature review.
Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Australian veterinary journal     Volume:  51     ISSN:  0005-0423     ISO Abbreviation:  Aust. Vet. J.     Publication Date:  1975 Oct 
Date Detail:
Created Date:  1976-02-20     Completed Date:  1976-02-20     Revised Date:  2003-11-14    
Medline Journal Info:
Nlm Unique ID:  0370616     Medline TA:  Aust Vet J     Country:  AUSTRALIA    
Other Details:
Languages:  eng     Pagination:  472-7     Citation Subset:  IM    
Export Citation:
APA/MLA Format     Download EndNote     Download BibTex
MeSH Terms
Descriptor/Qualifier:
Abattoirs*
Age Factors
Animals
Australia
Body Weight
Cattle*
Female
Lactation
Pregnancy
Pregnancy Tests
Pregnancy, Animal*
Seasons

From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine


Previous Document:  Cerebellar hypoplasia of genetic origin in calves.
Next Document:  The adverse effect of environment on the response to distemper vaccination.