Abstract: The only tumour known to be transmitted in nature by cell transplantation is the canine transmissible venereal tumour (TVT). The transmissible venereal tumour is transferred naturally by coitus and the tumour can be generated experimentally by inoculating living tumour cells into immunocompetent allogeneic dogs. Cytogenetic and immunological studies provide evidence that the tumour is transmitted by cells. Transmissible venereal tumour from various geographical origins is shown to have widespread and distinct chromosomal abnormalities, according to cytogenetic research. The basic material for comparative banding pattern analysis of transmissible venereal tumour chromosomes is now available, thanks to the definition of normal dog chromosomal banding patterns. These studies may help researchers figure out whether this rare tumour has a common cause or if it has recurred in household dogs. Immunological research also suggests that the transmissible venereal tumour is transmitted by cell transplantation. The immune response to the transmissible venereal tumour in dogs has proven that the tumour is antigenic and that immunological processes are involved in the generation of spontaneous regressions of this neoplasm. PubDate: 02 June, 2022
Abstract: Background and Objective: Zinc is important for several biological processes which are required by different species of animals at different ages of their life for maximum production and reproduction. This study was conducted to evaluate the effect of dietary Zinc (Zn) oxide on physiological, reproductive performance and growth rate of growing rabbits. Materials and Methods: Thirty-six New Zealand white rabbit bucks aged 4 months and with an initial average body weight of 2440 g were randomly allocated into 4 treatment groups containing 9 rabbit and fed diets containing 0, 50, 100 and 150 mg of zinc oxide per kg diet, respectively, for ten weeks in a Completely Randomized Design (CRD). Results: That zinc oxide supplementation significantly affected (p0.05). Conclusions: From these findings, we conclude that 100 mg of zinc oxide per kg diet supplementation was adequate to improve the physiological traits, productive and reproductive performance of rabbit buck while reducing the antioxidant stress factors in the semen thereby maintaining the integrity of the sperm without adverse effect on the animal. PubDate: 02 June, 2022
Open Access journal
