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Subject: Animal Genetics and Breeding ×

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Now showing 1 - 9 of 23
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    ThesisItemOpen Access
    A Study On Cross Breeding Of Desi With Landrace And Large White Yorkshire Pigs
    (Birsa Agricultural University, Ranchi, 1989) Sharma, Banshidhar; H. R. Misra
    1.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.
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    ThesisItemOpen 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. Misra
    1.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.
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    ThesisItemOpen Access
    Studies On Response And Correlated Response To Selection In Mice
    (Birsa Agricultural University, Ranchi, 1989) Nath Surendra; R. L. Singh
    Based 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.
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    ThesisItemOpen 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. Singh
    1.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 adver
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    ThesisItemOpen Access
    Genetic Studies on Some Production and Reproduction Traits in Landrace and Their Halfbreds
    (Birsa Agricultural University, Ranchi, 1989) Kumar Sandip; no
    The 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.
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    ThesisItemOpen Access
    Genetic Analysis Of Some Milch And Reproduction Characters In Goats
    (Birsa Agricultural University, Ranchi, 1988) Mukherjee, Dev Kumar; C.S.P. Singh
    This study indicated that Beetal half-breds produced more milk than the Jamunapari half-breds under semi-intensive (Farm) and extensive (Village) manage mental systems. The milk yield increased with parity up to 3rdlactation after which it declined. Twin producing goats of all the three genetic groups had higher milk yield than the single producers. Persistency of milk yield was the highest in Beetal half-breds and lowest in Black Bengal goats. Life time milk production up to 4th lactation may be reliably predicted with the help of 1st lactation yield. The animals born single came in 1st heat earlier than those born as twins. Similar trend was observed forage at 1st kidding also. The trend of production and reproduction performances of the goats under extensive system was almost the same as that of organized herd. The effect of herd wise was not significant on any production and reproduction traits under extensive system of management.
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    ThesisItemOpen Access
    A STUDY ON CROSSBREEDING IN PIGS
    (Birsa Agricultural University, 1987) SINGH, KSHETRIMAYUM JBOCHOUBA; SINGH, R.L.
    The present investigation was undertaken to study the genetics of growth in terms of live weight and linear body measurements from birth to 16th weeks of age along with mortality and feed efficiency at various stages of life in Large White Yorkshire, 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 weight at birth and at weaning, pre-weaning and post weaning daily weight gain, mortality percentage and feed efficiency was observed. (2) The rate of post-weaning daily gain in the crossbreds was as high as that observed in Large White Yorkshire. (3) The pre-weaning and post-veaning mortality percentage vas almost of the same magnitude in Large White Yorkshire and crossbreds, whereas in desi it was significantly higher than the other genetic groups. (4) Significantly highest feed efficiency was observed in Large White Yorkshire followed by crossbreds and desi. (5) The efficiency of prediction of live weight on various linear body measurements was quite high.
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    ThesisItemOpen Access
    INHERITANCE OF GROWTH BODY CONFORMATION, CARCASS CHARACTERISTICS AND SURVIVABILITY IN GOATS
    (Birsa Agricultural University) DRON, DILIP KUMARSINGH; MISHRA, H.R.
    Following conclusions were drawn on the basis of present findings: (1)Beetalhalfbreds were superior to Jamunapari half breds and purebred Black Bengals in body weight during early stages of growth. But this superiority declined with age. The body weights of two halfbreds become almost equal at the age of 9 months. (11)These results suggested need of special care to Beetalhalfbreds during initial post-weaning period for maintaining proper rate of growth. (111) The crossbreds gained significantly more in weight and linear body dimensions than the purebred Black Bengals except in paunch-girth. (iv) Low to moderate heritability of birth weight indicated that heavier kids may be produced by selection as well as by better managemental conditions. (v) Significant positive phenotypic and moderately high estimates of genetic correlation between body weights at 3rd and 6th month of age in Black Bengal indicated that the animals could be selected for higher body weight at 6th month of age on the basis of their weights at 3rd month. In halfbredJamunapari body weight at 4th week of age could be used as selection for higher weight at 6th month.
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    ThesisItemOpen Access
    Genetic and phenotypic evaluation of different economic traits in OT and OM strains of white Leghorn Birds
    (Birsa Agricultural University, 1981) Singh, Lal Babu; Singh, R.L.
    The present study was undertaken to compare two strains (OT and OM) of white Leghorn birds at initial stage of lay with respect to various production and reproduction traits besides response to selection on the basis of egg production upto 200 days of age. The average hatch weight of chicks was 31.86 0.091 and 30.00 0.372 g in OT and OM strains respectively showing significant difference between the two strains. The heritability for this trait in OT and OM strains was -0.062 ± 0.115 and -0.150 0.159 respectively. Positive phenotypic, genetic and environmental correlations of hatch weight with body weight at 20 weeks of age were obtained in both the strains. The average body weight at 20 weeks of age was 1061.35 13.00 and 1003.20 16.425 g in OT and OM strains respectively indicating significant difference between the two strains. The heritability estimates for this trait were 0.379 +0.198 and 0.829 ± 0.408 in OT and OM strains respectively. Positive phenotypic, genetic and environmental correlations were found between body weight at 20 weeks of age and egg production upto 200 days of age in both the strains, whereas this trait was observed to be negatively correlated with age at 1st lay in both the strains. The average age at 1st lay was obtained to be 164.92 0.766 and 171.22 ± 1.048 days in OT and On strains respectively. There was highly significant difference between the two strains.