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The Influence Of Egg Weight On Hatchability Chick Weight And Its Subsequent Performance Upto Six Weeks

by Farooq, M | Ehtisham Pervaiz | Mian Nisar | Muhammed Aslam Bhatti.

Material type: book Book; Format: print ; Literary form: not fiction Publisher: 1989Dissertation note: This study was conducted at the poultry department, college of Veterinary Sciences Lahore, to examine the effect of egg weight on fertility, hatchability, chick weight and their subsequent performance up to six weeks of age. Eggs of Hubbard Broiler breeders were used in this study. The eggs were classified in four weight groups, viz; A, B, C and D with the weight range of 48-51 gms, 52-55gms, 56-59gms and 60-63gms respectively. One hundred and fifty eggs of each group were selected randomly and incubated in the hatchery. Fertility and hatchability were recorded on the 18th and 21st days of incubation respectively. Sixty chicks from each egg weight class were picked up randomly. The chicks were weighed and wing banded individually and was transferred to the thermostatically controlled electric brooder. The chicks within each egg weight group were further divided into four sub-groups with 15 chicks in each sub-group. The records of weekly weight gain, total weight and feed consumption were maintained and feed efficiency was also measured. No culling was practiced during the conduct of the experiment. Mortality, whenever occurred was recorded. The results of the present study showed a higher percentage of fertility in the group D than in groups A, B and C whereas the fertility in the group B and C was identical. The hatchability of eggs was higher in group B, followed by group C, A and D. The chicks hatched from various egg weight groups differed significantly from each other in respect of their weights. Chicks of group D had the highest weight followed by group C, B and A respectively. Statistically highly significant differences were observed in the subsequent growth up to 6th week of age. The feed consumption and feed efficiency of group D was apparently higher than the other three groups, but statistically there was no significant difference. Mortality was higher in group A than in the groups B, C, and D. The number of dead chicks being 4, 3, 1 and 1 respectively. It is concluded from the present study that chicks hatched from larger and medium eggs were heavier at day old, gained considerably more weight up to 6th week of age and shoed a lower percentage of mortality as compared to chicks hatched from smaller eggs. However the chicks from smaller eggs consumed the same quantity of feed as consumed by chicks from larger and medium eggs so it is not economical to select small eggs for hatching in commercial broiler production. Availability: Items available for loan: UVAS Library [Call number: 0013,T] (1).

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Effects Of Clopidol And Lasalocid (Avatec) (Coccidiostats) On The Immunity Of Broiler Chicks Vaccinated

by Umer Farooq, M | Dr. Syed Ata-ur-Rehman Rizvi | Dr. Khalid | Dr. Muhammad Akram Munir | Faculty of Veterinary Sciences.

Material type: book Book; Format: print Publisher: 1994Dissertation note: The birds that received Avatec at recommended dosage levels had higher body weight than the Clopidol medicated, Cyclophosphamide treated or untreated control birds. Both Avatec and Clopidol treatments did not adversely affect the weights of bursa of Fabricius, spleen, thymus and liver of birds. Cyclophosphamide treatment of birds in early life resulted in.bursal atrophy and slight depression of splenic weight gain. Avatec and Clopidol were immuno-stimulants and birds eating medicated rations had higher antibody titres as compared to control birds. The NDV vaccinated birds on Avatec and Clopidol medicated rations and those on non-medicated rations resisted challenge with a virulent ND virus, while the non-vaccinated birds of any treatment group and vaccine free control could not withstand this challenge. Conclusions This study indicated that Clopidol and Avatec, when used at recommended dosage levels (25 gm of Premix/50 kg of feed and 6.25 gm of pure drugl5O kg of feed respectively) did not interfere with the development of birds; did not have any adverse effects on weights of lymphoid organs such as bursa of Fabricius, spleen, thymus, liver; did not interfere with the development of humoral immunity in vaccinated birds. Their medication in feed rather produced beneficial effects on serum, weight gain and antibody production. The injection of Cyclophosphamide resulted in lower body weights, destruction of the bursa of Fabricius, poor antibody response of birds to vaccination against NDV, and very high post-challenge mortality. The weight gain studies indicated that vaccinated and non- vaccinated birds on Clopidol and Avatec medicated feeds had non- significantly higher body weights that those on non-medicated ration at 56 days of age. Avatec at recommended dosage level, had more beneficial effects on the body weights than the Clopidol. These studies further indicated that vaccinated birds kept on Avatec medicated feed had significantly higher serum antibody titres on day 56 than the vaccinated non-medicated control birds. From the results of this study it is concluded that Avatec and Clopidol are not immuno-suppressive drugs when used at recommended dosage levels. They rather have beneficial effects on growth performance and immune response of birds. However, there is a need for further investigations. Availability: Items available for loan: UVAS Library [Call number: 0459,T] (1).

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