Influence of reproduction on hair production of Angora does

 

A. Baca# & M.A. Snyman

Grootfontein Agricultural Development Institute, Private Bag X529, Middelburg (EC), 5900, South Africa

 Ayanda Baca

 

Hair production of Angora goats requires six times more energy than growth. A phenomenon was observed at the Jansenville Experimental Station where lactating does did not produce any hair, or much less hair than during the shearings when they were not lactating. Data recorded from 2005 until 2012 on the fine hair (435 does), F2-crossbred (745 does) and F3-crossbred (573 does) herds at the Jansenville Experimental Station were analysed to quantify the effect of reproduction on hair production. Only does that kidded were included in the data set analysed. Goats at Jansenville are shorn every four months, namely during March, July and November. Does are mated during April and kid during September. Kids are weaned in January at four months of age. It is usually during the November shearing that the does do not produce hair or produce less hair. GLM-procedures of SAS were used to obtain least-squares means for total weight of kids weaned, number of kids born and weaned, as well as body weight and fleece weight at the March, July and November shearings of the does. Fine hair does that lost hair during lactation will be depicted as F-1, while fine hair does that produced hair will be depicted as F-2. The following corresponding notation will be used for the F2- crossbred does (F2-1 and F2-2) and F3-crossbred does (F3-1 and F3-2). Of the F2-crossbred does in the data set, 37% produced no hair (F2-1), while 27% of the F3-crossbred does did not produce any hair (F3-1). Although only 8% of the fine hair Angora does did not produce any hair (F-1) during the November shearing, 25% of them produced 300 g or less hair. F2-1 does had a higher kidding rate (1.23 ± 0.02) than F2-2 does (1.10 ± 0.01). The F3-1 kidding rate (1.17 ± 0.03) also differed significantly from the F3-2 (1.10 ± 0.02). Differences in the number of kids weaned were observed in the Fine hair and F2-crossbred herds. F-1 and F-2 weaned 1.12 ± 0.04 and 1.02 ± 0.01 kids respectively, whilst F2-1 and F2-2 weaned 1.14 ± 0.02 and 1.06 ± 0.01 kids respectively. Fine hair does produced 18.58 ± 0.75 kg and 16.38 ± 0.22 kg total weight of kids weaned for F-1 and F-2 respectively. Corresponding values for F2-1 was 20.11 ± 0.27 kg, compared to 18.56 ± 0.20 kg for F2-2. The body weight of the does during the July shearing also differed within all the herds. F-1 does weighed 44.60 ± 0.99 kg compared to the F-2 (39.29 ± 0.34 kg) does; F2-1 (43.16 ±0.14 kg) vs. F2-2 (41.30 ± 0.31 kg); F3-1 (40.26 ± 0.54 kg) vs. F3-2 (38.97 ± 0.28 kg). The fleece weight was higher for the F-2 (0.92 ± 0.02 kg) than F-1 (0.53 ± 0.06 kg) does during the July shearing. Corresponding values for the F2-crossbred does were 1.03 ± 0.02 kg and 0.92 ± 0.02 kg for F2-2 and F2-1 does respectively. F3-2 and F3-1 produced 1.13 ± 0.02 kg and 1.00 ± 0.03 kg hair respectively. Further studies, including hormone profiles as well as recording of milk production of the does will be done in order to clarify the relationships among reproduction, milk production and hair production in Angora goats.

 

Published

Proceedings 47th SASAS congress, Pretoria