title: Eruption of first permanent incisors and live weight gain in grazing yearling Angora goats.
abstract: OBJECTIVE
  To investigate the effects of the timing and duration of eruption of the first permanent incisors, live weight, sex and other factors on contemporaneous live weight gain in Angora goats.
  
  
  METHODS
  Goats were previously part of a pen study on the effects of energy intake of Angora does during pregnancy and lactation on kid development. The design was 3 levels of nutrition in mid-pregnancy by 2 levels of postnatal nutrition in 17 randomised blocks.
  
  
  METHODS
  Artificial insemination, ultrasound examination and feeding does in pens enabled accurate conduct of the study. After weaning, goats were grazed in sex groups. Live weight change between 14 and 20 months of age was related to deciduous first incisor loss and permanent first incisor development and other attributes assessed before the study.
  
  
  RESULTS
  Live weight change was related to the elapsed time for first permanent incisors to commence eruption and to the length of time for first permanent incisors to erupt. This response was affected by sex. Over summer and autumn, entire males with short eruption intervals gained 2-3 kg more than entire males with long eruption intervals. Females that reached first permanent incisor eruption by mid-summer had a live weight gain of 3 kg more than those that reached the same development 3 months later.
  
  
  CONCLUSIONS
  Live weight change in yearling Angora goats was associated with the process of first permanent incisor eruption. In females, live weight gain was greater when first permanent incisor eruption was earlier. In males, live weight gain was greater when first permanent incisor eruption was faster.
authors.affiliation: Institute for Frontier Materials, Deakin University, Geelong, Victoria, 3220, Australia. bruce.mcgregor@deakin.edu.au
authors.forename: B A
authors.initials: BA
authors.lastname: McGregor
authors.forename: K L
authors.initials: KL
authors.lastname: Butler
mesh_terms: D000375:Aging / Q000502:physiology; D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development / Q000502:physiology; D019229:Dentition, Permanent; D005260:Female; D006041:Goats / Q000254:growth & development / Q000502:physiology*; D008297:Male; D012621:Seasons; D012737:Sex Factors; D013997:Time Factors; D014078:Tooth Eruption / Q000502:physiology*; D015430:Weight Gain / Q000502:physiology*