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

Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics. Research Abstract Details 

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Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics. Abstract Text:

P K O'rourke,K W Entwistle,C Arman,C R Esdale,B M Burns,

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.

Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics. Publishing Authors By Initials

PK O'rourke,KW Entwistle,C Arman,CR Esdale,BM Burns,

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Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics. Journal Published:

PUBLICATION TYPE: Journal Article

Journal: Theriogenology

VOLUME: 36

Page Numbers: 839-53

Journal Abbreviation: Theriogenology

ISSN: 0093-691X

DAY: 26

MONTH: Nov

YEAR: 1991

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

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LANGUAGE: eng

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Grant and Affiliation Information for Fetal development and gestational changes in Bos taurus and Bos indicus genotypes in the tropics.

AFFILIATION: Queensland Department of Primary Industries G.P.O. Box 46, Brisbane, Qld, 4001, Australia.

Country: United States

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MEDLINETA: Theriogenology

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