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Author: Ravindra Kumar × Thesis Type: Ph.D ×
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    ThesisItemOpen Access
    Studies on effect of neonicotinoids on colony development of Apis mellifera L. and foraging behavior of honey bee species in mustard crop
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2021-03) Ravindra Kumar; Mall, Pramod
    Studies on effect of imidacloprid 70 WS seed treatment and thiamethoxam 25 WG spray at pre-bloom and 10% bloom on colony development of Apis mellifera L. and foraging behavior of honey bee species in mustard crop were carried out at Govind Ballabh Pant University of Agriculture and Technology Pantnagar, Udham Singh Nagar, Uttarakhand during 2018 and 2019. The experiment was conducted in both semi and open field conditions. Observations were recorded regarding effect of imidacloprid seed treatment, thiamethoxam spray at pre-bloom and 10% bloom on colony development, foraging behavior, mortality and yield parameters of Indian mustard. The risk to honey bee colonies in the field was investigated by exposing the colonies to imidacloprid seed treatment and thiamethoxam treated mustard crop at rates recommended for insect control. Detailed examination of colony development throughout the period of exposure demonstrated that under open and semi-open field condition thiamethoxam spray at 10% bloom had a negative impact on brood, pollen, nectar, honey capped and egg cell area under open and semi-open field condition. Foraging activity and foraging rate was found to be significantly less in thiamethoxam spray at 10% bloom in comparison to thiamethoxam spray at pre-bloom, imidacloprid seed treatment and control. Mortality of adults of Apis mellifera L. was significantly higher in thiamethoxam spray at 10% bloom in comparison to thiamethoxam spray at pre-bloom, imidacloprid seed treatment and control under open and semi-open field condition. Mustard yield was found to be highest in imidacloprid seed treatment followed by thiamethoxam spray at 10% bloom, pre-bloom and control under open and semi-open field condition.
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    ThesisItemOpen Access
    Heavy ion irradiation induced effects on MgB2 thin films
    (Govind Ballabh Pant University of Agriculture and Technology;Pantnagar, 2006) Ravindra Kumar; Agrawal, H.M.
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    ThesisItemOpen Access
    Genetic analysis of body weight and wool yield traits in chokla sheep
    (Govind Ballabh Pant University of Agriculture and Technology;Pantnagar, 2000) Ravindra Kumar; Singh, C.V.
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    ThesisItemOpen Access
    Studies on feeding green berseem (Trifolium alexandrinum) on growth performance and carcass traits in pigs raised on kitchen waste based diet
    (G.B. Pant University of Agriculture and Technology, Pantnagar - 263145 (Uttarakhand), 2010-08) Ravindra Kumar; Ashok Kumar
    A study was conducted to evaluate the effect of different levels of green berseem, kitchen waste and concentrate feeding on growth and carcass traits in growing and finishing pigs. The experiment was conducted in two phases using 24 LWY piglets of about 3 to 3.5 months age. During phase I, the performance of growing piglets was studied for 2 months. The details of feeding regimens in different groups were as follow, group I: 10% green berseem + 90% concentrate only, Gr. II: 10% green berseem + 25% kitchen waste + 65% concentrate, Gr. III: 10% green berseem + 50% kitchen waste + 40% concentrate and group IV: 10% green berseem + 75% kitchen waste + 15% concentrate. During phase II, the performance of finisher pigs was studied for 2 months. Pigs were divided again into 4 groups. Distributions of feed in different such groups have been presented as follow, group I: 10% green berseem + 50% kitchen waste + 40% concentrate, Gr. II: 15% green berseem + 50% kitchen waste + 35% concentrate, Gr. III: 20% green berseem + 50% kitchen waste + 30% concentrate and group IV: 25% green berseem + 50% kitchen waste + 25% concentrate. The ad libitum feeding would be done during both phases. During phase I, there was no significant difference between different treatment groups with respect to overall DM intake, body weight gain and FCR. However, better performance was observed for group IV. In conclusion, substitution of concentrate for different levels of kitchen waste along with 10% green berseem improves the DM intake, growth and FCR than that of the control diet. During phase II, significantly (p<0.01) highest overall DM intake and overall daily weight gain was observed for Gr. I and no significant difference were observed among Gr. II, III and IV. However, no significant differences were observed for overall body weight gain and FCR. In conclusion substitution of concentrate for different levels of green berseem along with 50% kitchen waste reduced the DM intake and growth but improved the FCR than that of the control diet. It also decreases the back fat thickness however, differences among groups were non-significant. No significant differences were observed for other carcass traits. Significantly (p<0.01) lowest cost of total feed intake and cost per kg live weight gain was observed for group IV followed by group III, II and I in both phases of experiment. In conclusion green berseem could be incorporated up to 25% and kitchen waste up to 75% of total dry matter intake to make the feed economical and without affecting the performance of the animal adversely.