Determinants of permanent first incisor eruption in grazing Australian Angora goats

McGregor, B. A. and Butler, K. L. 2011, Determinants of permanent first incisor eruption in grazing Australian Angora goats, Australian veterinary journal, vol. 89, no. 12, pp. 490-495.

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Title Determinants of permanent first incisor eruption in grazing Australian Angora goats
Author(s) McGregor, B. A.ORCID iD for McGregor, B. A.
Butler, K. L.
Journal name Australian veterinary journal
Volume number 89
Issue number 12
Start page 490
End page 495
Total pages 6
Publisher Wiley
Place of publication London, England
Publication date 2011
ISSN 0005-0423
Keyword(s) angoras
live weight
Summary Objective: To investigate the effects of live weight, sex and other factors on deciduous (first incisor) loss and permanent first incisor development in Angora goats. Design: Goats were part of a pen study on the effects of energy intake in Angora does during pregnancy and lactation on kid growth and development. The design was three levels of nutrition in mid-pregnancy × two levels of postnatal nutrition in 17 randomised blocks. Methods: Conception times were calculated by using artificial insemination, with ultrasound examination 43 days after insemination. Does were fed different amounts of a formulated diet in their pens. After weaning, goats were grazed in sex groups. Deciduous first incisor loss and permanent first incisor development were recorded at 11 time points from 14 to 20 months of age. Results: For each sex, the time for visible eruption and full development of permanent first incisor declined linearly with increased live weight by 5.9 and 5.4 days/kg live weight, respectively. The time to reach similar development stages for first permanent incisors eruption was 3 months longer for the lightest animals compared with the heaviest animals. Date of birth, birth weight, doe age, growth rates, mid-pregnancy and postnatal nutrition, parity, day of weaning and weaning weight had no detectable effect. Conclusions: The results explain much of the substantial range in reported first permanent incisor eruption dates for small ruminants and have application in ageing of goats, marketing of kids for meat, in the selection of animals for breeding flocks and in educational material.
Language eng
Field of Research 070202 Animal Growth and Development
Socio Economic Objective 830304 Goats
HERDC Research category C1 Refereed article in a scholarly journal
Copyright notice ©2011, Wiley
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