Abstract

NGOULA, F. et al. Zootechnical performances of grasscutter (tryonomys swinderianus) in captivity in soudano-guinean highlands. Arch. zootec. [online]. 2009, vol.58, n.223, pp.441-449. ISSN 1885-4494.

In order to improve on the reproductive performances of grasscutters (Tryonomys swinderianus) in captivity, a study was conducted in the grasscutter distribution centre at CIPCRE¹ Bafoussam, Cameroon. The reproductive performances of 53 gestating females (37 in the first and 16 in the second) were studied. The major results showed that the average litter size at first litter was 4.44 ± 1.41 which increased on second birth. A mortality rate of 7% was observed in the first litter which significantly (p<0.05) increase to 11% in the second litter. The number of grasscutters born alive per litter (4.12 ± 1.68) remains relatively unchanged in the two litters. A sex ratio of 0.92:1 and 1.06:1 was observed in the first and second litter respectively. The post natal mortality rate (36%) decreased with litter number and varies inversely with the female weight at reproductive maturity. The birth and weaning weight (138 ± 21 and 533 ± 84 g respectively) were higher in the second litter with weaning rate of 97%. The mortality rate of 70% was observed in the study which resulted from respiratory, gastro-intestinal tract diseases and some accidental cases. Metabolic diseases were more frequent in the males grasscutters. However, death rate in the females was twice that of the males.

Keywords : Pregnancy; Birth; stillbirths; Sex-ratio; Morbidity; Weaning; Mortality.

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