GENETIC STUDIES OF GROWTH AND REPRODUCTIVE PERFORMANCE OF BLACK BENGAL GOAT AND ITS HALF BRED KIDS
| dc.contributor.advisor | Singh, L. B. | |
| dc.contributor.author | Kumar, Amit | |
| dc.date.accessioned | 2017-08-01T07:45:19Z | |
| dc.date.available | 2017-08-01T07:45:19Z | |
| dc.date.issued | 2009 | |
| dc.description | GENETIC STUDIES OF GROWTH AND REPRODUCTIVE PERFORMANCE OF BLACK BENGAL GOAT AND ITS HALF BRED KIDS | en_US |
| dc.description.abstract | Black Bengal is the only recognized breed of goat available in Jharkhand. It is one of the best breed in India due to its high prolificacy, better reproductive traits, good quality meat and hide. The number of kid born in a kidding (litter size) is more as compared to other breed of India. The age of maturity is significantly less in Black Bengal than the other breeds. These traits help doe to produce more kids in her life than the other breeds. But due to smaller size of body, the quantity of meat produced by males of this breed does not fetch a high economic return. To overcome this, improvement in body weight can be made by cross breeding followed by intrapopulation selection for utilizing additive genes and efficient management. Cross breeding can be done by using Black Bengal goat as female-line and Beetal and Sirohi as improver breed (male). Goat rearing being the only means of survival for small farmers in remote villages, there is a need to develop a scientific method of goat improvement without causing an adverse impact on the environment. A systematic breeding programme for improving Black Bengal goats was initiated under AICRP in Ranchi Veterinary College with the financial assistance of ICAR in early eighties. Males of Jamunapari, Beetal and Sirohi were used as improver breeds. A lot of earlier work was also done to study the performance of crossbreds. However, with continuously changing environmental scenarios all over the world and Jharkhand it is important to study the present performance of these crossbreds. Keeping these points into consideration, this study was conducted with the following objectives: 1. To evaluate different genotypes of goats and suggest suitable genotype for meat production for the agroclimatic condition of Jharkhand. 2. To estimate genetic and phenotypic parameters of pre-weaning and postweaning growth. 3. To study the reproductive performance. 4. To develop selection criteria for evaluating growth and reproductive efficiencies of goats. This study was carried out on 471 number of goats for study of growth traits and 351 numbers of goats for reproduction traits study in different genetic groups viz. Black Bengal, ½ Beetal + ½ Black Bengal and ½ Sirohi + ½ Black Bengal. Data generated in goat farm of Ranchi Veterinary College, Ranchi were utilized in the present study. Due to non-orthogonal nature of data, it was analysed by least-squares maximum likelyhood method of analysis by using SPAB developed by I.A.S.R.I., New Delhi which uses Harvey’s algorithms for analysis of the same. The main findings of this study are as follows: Higher pre-weaning body weight of Beetal halfbreds revealed that Beetal halfbreds buck could be utilised as improver for potential and adaptable breed of goat for meat production. Comparatively better growth of winter born kids than those of summer and monsoon season indicate that breeding plan should be restructured to get large number of kids in late phase of winter. In general pre- weaning growth is negatively associated with litter size at birth 2 whereas dam weight at kidding and parity of dam are positively associated with these traits. Litter weight as per unit dam’s weight was found to be highest in Black Bengal goat. On this basis it can be used for the further improvement. Higher relative growth rate during 0-6 month indicates that its improvement through selective breeding is possible. In general low magnitude of heritability of body weights indicate that the exploitation of non-additive genetic variance will be of great importance for improvement of this trait. Low magnitude of heritability of relative growth rate and litter weight per unit dam weight of goat indicate that non-additive genetic variance will be of great importance for these traits as well Exploitation of non-additive genetic variance with improvement in managemental condition will be of great help in altering growth traits and relative growth rate in positive direction. Significant positive phenotypic correlation of 8-week body weight and 3 - month body weight revealed that kids could be selected on 8-week body weight for improvement in later stage of growth. In the same line significant positive phenotypic correlation of 8-week and 4- week body weight revealed that kids could be selected on the basis of 4-week body weight for further improvement. Black Bengal were excellent for reproductive performance they have significantly lower age at first conception , age at first kidding , first service period and first kidding interval than halfbred. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810026943 | |
| dc.keywords | GENETIC STUDIES OF GROWTH AND REPRODUCTIVE PERFORMANCE OF BLACK BENGAL GOAT AND ITS HALF BRED KIDS | en_US |
| dc.language.iso | en_US | en_US |
| dc.pages | 147 | en_US |
| dc.publisher | Birsa Agricultural University, Kanke, Ranchi, Jharkhand | en_US |
| dc.sub | Animal Genetics and Breeding | |
| dc.these.type | M.V.Sc. | |
| dc.title | GENETIC STUDIES OF GROWTH AND REPRODUCTIVE PERFORMANCE OF BLACK BENGAL GOAT AND ITS HALF BRED KIDS | en_US |
| dc.type | Thesis | en_US |