The effects of age and plane of nutrition on the body and carcass composition and mohair
fibre yield and quality of British Angora wether goats slaughtered at six, 12, 18 and 24
months of age were investigated. Carcass yield, composition and conformation improved
with increasing age and plane of nutrition. Greasy fleece weight also increased with
increasing age and plane of nutrition but fibre quality declined since the increase in mass was
achieved by means of increased fibre diameter with no effect of age or plane of nutrition on
the fibre elongation rate. There was a constant relationship between the increase in fibre
diameter with age and fleece mass which was not affected by plane of nutrition. Similarly
there was no significant effect of plane of nutrition on the relationships between fibre
diameter and the weight of various body and carcass components. A strong relationship
between fibre diameter and the weight of fat in the body or carcass suggested that the increase
in fibre diameter with age of the goat was influenced by cumulative feed intake rather than by
fat-free body size.
The allometric growth patterns of the body and carcass of the Angora goat conformed with
the patterns established for other domestic species, with early maturity of the external offal
and vital organs, later maturity of the carcass and body fat, and a centripetal pattern of
development. There was no effect of plane of nutrition on the allometric growth patterns of
the fat-free body or carcass, but decreasing the plane of nutrition resulted in a uniform
retardation of all body parts and carcass tissues and a significant effect on the relative growth
rate of body and carcass fat.
Regression equations were formulated to predict the half carcass composition of Angora
wether goats using sample joint dissection data. The most accurate predictions were achieved
with data from the leg and the best end of neck combined in multiple regression equations.
A second experiment to investigate the effects of long term undernutrition followed by
realimentation on the growth rate and composition of empty body weight gain revealed no
evidence of compensatory liveweight gain in the Angora goat
