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Birsa Agricultural University, Ranchi

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1984 - 19897
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Subject: Animal Genetics and Breeding × End date: 2007 × Thesis Type: Ph.D ×
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Now showing 1 - 7 of 7
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    ThesisItemOpen 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. Mishra
    Conclusions # 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.
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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 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
    Studies on Two way family selection for Egg Production and Its Correlated Responses to some unselected Fitness Traits in Trinolium Castaneum
    (Birsa Agricultural University, Ranchi, 1986) Verma, Shashi Bhusan; Singh, R.L.
    The effects of selection, generation and generation x selection with respect to total egg production (eth-10th day egg number) were highly significant (P/ 0.01) in both the high and low lines. The replicate, generation x replicate and selection x replicate effects were non-significant. In the high lines the phenotypic and genetic responses vere larger at higher intensity of selection. In all the high and low lines there was good agreement between the average realised and predicted responses per generation for the selected trait. There was symmetry in response for the high and low lines at both the selection intensities. For each selection intensity the divergence increased gradually between the two lines. The trend of observed correlated responses in 8th, 9th and 10th day egg number was positive through out the experimental period. The trend in hatchability was, in general, positive. As regards, pupation time and adult emergence time the trend was in negative direction. There was fair agreement between the observed and expected correlated responses with respect to 8th, 9th and 10th day egg number. The realised correlated responses for hatchability, pupation time and adult emergence time, however, fell short that of the predicted ones.
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    ThesisItemOpen Access
    Studies on the construction of Selection indices on Broiler Birds
    (Birsa Agricultural University, Ranchi, 1984) Akhtar, S.M. Humayun; Mishra, H.R.
    The investigation reported in this thesis van based upon the experiments conducted on 833 Red Cornish and 1,792 shite Rock birds (belonging to 44 and 05 siren respectively) procured from Central Avian Research Institute, Izatnagar and subsequently maintained at the Experimental poultry Unit et Ranchi Veterinary College, Ranchi, and vas planned with the following objectives: 1. To estimate the genetic and phenotypic architecture with respect to broiler and production traits of the two above mentioned breeds. 2. To construct several selection indicens separately for male and female lines involving some economic traits. 3.To estimate responses in the constituent traits and also in aggregate genetic economic value in each case consequent upon one round of index selection. 4.To compare the efficiency of the tandem, independent culling level and index selections. 5.To construct restricted selection indices imposing restriction on one or two traits at a time and to estimate the genetic cost of imposing restriction in each case. 6.To construct selection indices for multi-stage indox selection and to evaluate their efficiencies.