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Determinants of permanent first incisor eruption in grazing Australian Angora goats.
MedLine Citation:
PMID:  22103948     Owner:  NLM     Status:  In-Data-Review    
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.
Ba McGregor; Kl Butler
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Australian veterinary journal     Volume:  89     ISSN:  1751-0813     ISO Abbreviation:  Aust. Vet. J.     Publication Date:  2011 Dec 
Date Detail:
Created Date:  2011-11-22     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0370616     Medline TA:  Aust Vet J     Country:  Australia    
Other Details:
Languages:  eng     Pagination:  490-5     Citation Subset:  IM    
Copyright Information:
© 2011 The Authors. Australian Veterinary Journal © 2011 Australian Veterinary Association.
Deakin University, Geelong, Victoria 3217, Australia (formerly Livestock Production Sciences, Future Farming Systems Research Division, Department of Primary Industries, Werribee, VIC, Australia); Biometrics Unit, Future Farming Systems Research Division, Department of Primary Industries, Werribee, VIC, Australia.
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