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Birsa Agricultural University, Ranchi
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ThesisItem Open Access A Studies on Some Economic Traits of Reciprocal Crosses of White Leghorn and Desi Birds Under Farm and Village Condition(Birsa Agricultural University, Ranchi, 1982) Krishna Murari Sah; Dr. B.D. SharmaThis study was undertaken to find out the combining ability between White Leghorn and Desi birds for growth, production and carcass characters. (1) The combining ability of WL male with Desi female vas better than those of Desi male with WL female with respect to fertility, hatchability and early embryonic death. (2) The progeny of Desi do x ML op were heavier than their counterparts (bdx Desi gg) at all stages of growth. (3) The growth of KL and Desi box wL oo birds was superior under farm conditions of rearing, while that of the other two genetic groupe (Desi and Loox Desi oo) were better under village conditions of rearing at 12th, 16th and 20th week of age. (4) The dressing percentage of Deni birds was more in comparison to other genetic groups. (5) The co-efficient of determination (R2) for prediction of dressed weight on live weight was 97.30, 99.73, 83.17 and and WL66 Desagg 99.75% in L. Desi, Desi box a co males slaughtered at 12th week of age. (6) Desi 60' x L 0o birds were 31.8, 33.3, 1.4, 15.7, 67.9. 30.0, 56.0, 19.4 and 13.6 percent superior to Desi birds for hatching weight, weight at 20th week of age, weight at first lay, age at first lay, egg production upto 240 days of age, clutch size, weight of first egg. length and width of first egg respectivelyThesisItem Open Access Genetic Studies on Some Economic Traits in Broiler Chickens(Birsa Agricultural University, Ranchi, 1985) Dipankar Chaudhuri; Dr.S.K.Verma1. The body weight and shank length in Red Cornish tended to be larger than that of the White Rook at almost all the ages of measurement, but reverse was the case for keel length. 2. The estimates of heritability for the body weights at various ages were more in Red Cornish than that of White Rock. However, all the heritability estimates of body weight, shank length and keel length were, in general, were low suggesting that simple selective breeding will not be much effective for the improvement of these traits. Therefore, the selection may be practiced on some kind of indexes or alternatively non-additive gene interaction effect may be utilized. 3. The selection of smaller chicks at day old stage may be preferred for the genetic improvement in the body weight at 8 weeks of age as the genetic correlation between these traits were negative. 4. The body weights at any of the ages at 2, 4 and 6 weeks may be used as a selection criterion for the genetic improvement of body weights at 8 or 10 weeks of age.ThesisItem Open Access Studies on Genetic and Phenotypic Parameters of lactation in Cross - Bred Dairy Cattle(Birsa Agricultural University, Ranchi, 1985) Sonam Tasering Bhutai; Dr. R.S. PandeyOn the basis of salient striking findings of this study, following conclusions could be drawn. 1. 3/4 to 1/2 HP groups behaved almost similarly for various economic traits which suggested that probably 1/2 exotic inheritance or slightly more than 1/2 was best suited for Indian conditions. 2. Significant effect of period suggested that manage mental conditions of the farm in recent year have slightly improved over the past. 3. It appeared in this study that animals did not attain full biological growth and production potential unless reached in 3rd lactation. This give guide lines to the breeders that on the basis of first and second lactation only, there is considerable risk involved in culling the animals. 4. Prediction of 300 days yield on the basis of first 30 days itself gave almost maximum accuracy in all the genetic groups which is economical too. 5. No generalized criteria could be applied to select animals of different genetic groups on the basis of their part lactation yield. Animals having high exotic inheritance (3/4) and low (3/8 HF) are probably required to be selected on the basis of 90 days part lactation yield where as, those having 1/2 and 5/8 HF level could be quite accurately selected on the basis of their 60 days records itself.ThesisItem Open Access Studies on genetic and phenotypic parameters of some economic traits in different grades ofcross-bred (Friesian X Zebu) Cattle(Birsa Agricultural University, Ranchi, 1984) Siya Ram Singh; H. R. MishraConclusions # On the basis of the findings of this investigation, the following conclusions were drawn – (1) Among Friesian X Sahiwal cross-bred grades, half-breds were superior in respect to body-weights at different ages. (11) Body-weight at 6 months of age can be used as a selection criterion, with considerable accuracy, for higher body-weights at different ages, higher first lactation yield, cumulative milk yields in first three and four lactations and better milk producing efficiency in Friesian X Sahival cross-breds. (111) Half-breds were also superior among all Friesian cross-bred grades, so far as lactation yield; peak yields cumulative milk yields in first four and five lactations; average milk yields per day of lactation length and calving-interval; service period and inter-calving period were concerned. However, cous having 62.5% Friesian inheritance had shortest average age at first calving as well as ary period and highest MPEK and MPEKD values among all Friesian X Sahiwal cross-bred grades under reference. (iv) The results of Multivariate analysis indicated that it cannot be assumed that grading up of Sahival cattle to the total replacement of their genes by those of Friesian origin, will lead to higher level of production.ThesisItem Open Access A Study On Cross Breeding Of Desi With Landrace And Large White Yorkshire Pigs(Birsa Agricultural University, Ranchi, 1989) Sharma, Banshidhar; H. R. Misra1.Landrace is more suitable for farm owing to its physical conformation and inherent genetic potential of faster growth at the finishing stage, whereas, Large white Yorkshire being more adaptable to rural condition with comparatively high post-weaning shock tolerance capacities stands ahead of the former for distribution in villages where its halfbreds perform better then Landrace halfbreds. 11. A decrease in magnitudes on pre-weaning body weights and linear body measurements with the increase of litter size at birth seemed to be a decisive factor of considerable importance in selection for phenotypic traits. 111. The lower rate of growth just after weaning in almost all the genetic groups suggested need of special care and management at that stage. 1V. Because of high resistance of weaning shock in halfbreds they excel the exotic over preference for any developmental programme in rural areas. If at all, exotics do not merit such consideration until they have crossed the weaning period at least by over one month. V. A significant superiority in litter size, apart from litter weight at birth and at weaning, is an additional advantage in economic traits by crossing of Desi sows with exotic boars over indigenously bred sows with Desi male.ThesisItem Open Access Genetic Architecture of Growth, Production And Reproduction In Black Bangal And Its Half- Bred Goats(Birsa Agricultural University, Ranchi, 1989) Singh, Lal Babu; H.R. Misra1.Beetal halfbrede vere superior to Jamunapari halfbreds and purebred Black Bengal in body weights during early stages of growth. The superiority declined with age. (2)The results suggested need of special care to both the balfbrede during initial post-weaning period for maintaining proper growth. (3) Phenotypic correlation of 3-month body weight with other growth trait in later ages was high in magnitude and might be the appropriate weight for selection for maximizing the weights during later part of life in all the three genetic groups. (4) Due to high genetic correlation of 3-mouth body weight with other growth traits, selection for higher body weight could be made on 3-month body weight. (5) The estimates of genetic trends revealed consider able genetic improvement in most of the traits. But all these seemed to be aullified by environmental trend which were in opposite direction. As a result of this, the desirable increase in body weights of Black Bengal due to genetic trend could not be exploited phenotypically.ThesisItem Open Access Studies On Response And Correlated Response To Selection In Mice(Birsa Agricultural University, Ranchi, 1989) Nath Surendra; R. L. SinghBased on the results of this study the following: Conclusions may be drawn: 1. The body weight and tail length at 6 weeks of age were found to be moderately heritable in the base population. 2. The genetic and phenotypic correlations between the two traits were found to be positive and high in magnitude. 3. The expected and realized cumulative selection differential consistently increased over generations in all the lines. 4. The response to selection for 6-week body weight was almost consistent over generations. However, discrepancy existed between the expected and observed responses. 5. The effect of selection, generation and generation x selection with respect to body weight and tail length at 6 weeks of age were highly significant. There was marked departure from linearity in the trend of improvement in the mean values over generations. The selection was found to be more effective in females than males, 6. The response was markedly high at 50% level of selection than that of 75% for body weight. 7. The correlated response of 6-week body weight while selecting for tail length and vice versa were found to have increasing trend and were mostly consistent over the generations.ThesisItem Open Access Genetic Studies On Some Economic Traits In Pure And Crossbred Pigs Under Farm And Village Condition(Birsa Agricultural University, Ranchi, 1989) Mukhoadhyay, Aloke; R. L. Singh1.In general, exotic breeds (Landrace and Tamworth) had highest body weight, daily weight gain and linear body measurements followed by crossbreds and Desi, Among crossbreds, T+ Dhad comparatively higher value at later ages of post weaning period than other two crossbreds. 11.Lover rate of growth just after weaning in almost all the genetic groups suggested need of special cars at that stage. 111. Exotic breeds and crossbreds had comparatively longer gestation period than Desi but just the opposite trend was observed in respect of farrowing interval. 1V. Irrespective of genetic group of boar in mating combination, in general, exotic breeds and three-breed crosses (LR+T+D) were comparatively superior to halfbreds followed by Desi in respect of litter size and litter weight at birth and at weaning. V. Overall highest survivability was observed in crossbreds among which TD had highest rate. Desi had highest survival rate during pro-weaning period followed by crossbreds and exotic pigs, but just the opposite trend was observed during post weaning period. vi. Special care should be provided to new born piglets during 1st week of age as highest mortality (near about 55 % of total mortality) was observed during this period, most probably due to their low resistance. vii. Winter and/or autumn farrowing should be avoided as it affected all the traits adverThesisItem Open Access Genetic Studies on Some Production and Reproduction Traits in Landrace and Their Halfbreds(Birsa Agricultural University, Ranchi, 1989) Kumar Sandip; noThe present investigation was undertaken to study the genetics of growth in terms of liveweight and linear body measurements from birth to 16th week of age along with mortality and feed efficiency at various stages of life in Landrace, desi and their crosses under farm managemental conditions. The following conclusions were drawn : 1. Significant effect of genetic group on body weight, body length, chest girth, height at withers at various ages, litter size and litter weight at birth and at weaning, pre-weaning and post-weaning daily weight gain, mortality percentage and feed efficiency was observed. 2. Landrace vas superior in respect of all the economic traite to halfbreds followed by desi. 3. of total deaths 64.20% occurred within two weeks of birth. 4. The efficiency of prediction of body weight on various linear body measurements was, in general, of moderate to high magnitude. There was a progressive increase in efficiency with the increase of age. 5.Significantly superior feed conversion efficiency was noticed in Landrace followed by halfbreds and desi. 6. All the phenotypic correlations of body weights with linear body measurements were positive and significant at all the ages. 7. Most of the genetic correlations between body weight and linear body measurements were positive and high.
