Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics

O'Rourke, P. K., Entwistle, K. W., Arman, C., Esdale, C. R. and Burns, B. M. (1991) Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics. Theriogenology, 36 5: 839-853. doi:10.1016/0093-691X(91)90350-M


Author O'Rourke, P. K.
Entwistle, K. W.
Arman, C.
Esdale, C. R.
Burns, B. M.
Title Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics
Journal name Theriogenology   Check publisher's open access policy
ISSN 0093-691X
1879-3231
Publication date 1991-11
Sub-type Article (original research)
DOI 10.1016/0093-691X(91)90350-M
Volume 36
Issue 5
Start page 839
End page 853
Total pages 15
Place of publication Philadelphia, United States
Publisher Elsevier
Language eng
Formatted abstract
Weights of the gravid uterus and fetus as well as the fetal measurements were determined at slaughter for 107 Bos taurus cows grazed on improved pastures and for 70 Bos indicus cows grazed on native pastures in northern Australia. The stage of gestation was assessed from palpation per rectum in early-to-mid gestation and at slaughter and from fetal development characteristics at slaughter.

The age and breed of the cow and the sex of the fetus did not significantly affect any of the uterine components or fetal measurements. Growth curves had dominant, positive linear components but negative quadratic ones, which improved the fit, particularly for the later stages of gestation. Uterine components and fetal measurements were highly correlated (0.94 to 0.99). For Bos taurus cows, there were higher estimates at birth for weights of the gravid uterus and the fetus, but estimates for other fetal measurements were similar to those for Bos indicus cows. Major fetal growth occurred during the third trimester, with the length of the foreleg tending to change relatively slowly and the head width quite fast during the first trimester.

Correction factors for cow liveweight to adjust to commonality for non-pregnancy were 5, 7, 10, 14, 20, 29, 43 and 65 kg for Bos taurus and 2, 4, 6, 10, 15, 23, 35 and 51 kg for Bos indicus at 2 to 9 months of gestation.
Q-Index Code BX
Q-Index Status Provisional Code
Institutional Status Non-UQ

Document type: Journal Article
Sub-type: Article (original research)
Collections: Queensland Alliance for Agriculture and Food Innovation
School of Veterinary Science Publications
 
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Created: Wed, 19 Jun 2013, 13:37:50 EST by Dr Brian Burns on behalf of Centre for Animal Science