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20003
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Subject: Poultry Science × End date: 2000 × Start date: 2000 × Type: Thesis × Thesis Type: M.V.Sc. ×
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    ThesisItemOpen Access
    Performance of crosses of indigenous naked neck with white leghorn and new hampshire
    (Department of Poultry Science, College of Veterinary and Animal Sciences,Mannuthy, 2000) Jomy John, KAU; Leo Joseph
    An experiment was conducted at Kerala Agricultural University Poultry Farm, Mannuthy, to evaluate and compare the production traits of Naked Neck x White Leghorn (NNWL) and Naked Neck x New Hampshire (NNNH) crosses under deep litter system of rearing from '20 to 40 weeks 'lge. Seventy five pullets of' each cross were housed in identical pens of 15 birds cach and production performance was evaluated for five 28- day periods from February to July 1999. Standard feeding and managemental practices were followed throughout the study . . The NNNH were heavier than NNWL at 20 weeks of age (1855.6 vs l496.lg) and at 40 weeks of age (2436.7 and 2004.1 g). The age at first egg of l46.8±1.48 days in NNNH was significantly earlier than 152±1.3days in NNWL. The age at 50 per cent production was similar in NNWL (162.4 ±1.92 days) and NNNH (164.6 ±1.7 days). The week-wise mean hen housed production in NNWL reached a peak of 80.57 per cent at 26th week of age, while NNNH attained a peak of 81.0 per cent at zs" week of age. The overall mean hen housed number up to 40 weeks of age was 86.39 in NNWL and 83.85 in NNNH. Hen day production remained the same as hen housed production up to 39th week of age and the overall trend was similar. The daily feed consumption from 21 to 40 weeks of age was 124.83g in NNWL and l2S.l4g in NNNH.,The feed conversion ratio per dozen eggs was 2.89 for NNWL and 3.01 for NNNH. Broodiness was shown by nine birds in NNWL for durations ranging from 9 to 63 days while eight birds in NNNH were broody for durations ranging from 22 to 69 days. The mean egg weight from 21 -- 40 weeks was 48.73g in NNWL and 48.44 g in NNNH. The shell thickness was 0.376 mm in NNWL and 0.373 in NNNH. The Haugh unit score was 84.78 in NNWL and 88.00 in NNNH. The plumage Colour in NNWL was off white, but a few birds showed brownish colour on wing feathers. 90 per cent of the NNNH birds had chestnut coloured plumage resembling New Hampshire birds while the rest were multi coloured resembling indigenous Naked Neck birds. Egg shell was tinted in NNWL while NNNH eggs were brown or shades of brown. The livability was 98.7 percent in NNWL, while it was 100 per cent in NNNH. The cost of feed consumed per egg was 202.12 paise for NNWL and 208.94 paise for NNNH [or the entire course of the study. Both NNWL and H cross had statistically comparable hen housed production, egg weight, feed consumption and feed conversion ratio. Both the crosses had excellent livability and good egg quality. However a significantly higher body weight both at 20 and 40 weeks of age, earlier average age at first egg, coloured plumage pattern, and brown shelled eggs in NNNH cross are much preferred by rural farmers, The results of the present study warrants further studies on Naked Neck x New Hampshire cross under field conditions.
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    ThesisItemOpen Access
    Influence of microbial phytase on nutrient utilization in broilers
    (Department of Poultry Science, College of Veterinary and Animal Sciences, Mannuthy, 2000) Balasubramanian, D; KAU; Jalaludeen, A
    An eight week feeding trial using 180 day-old broiler chicks was conducted to study the influence of phytase supplementation (Natuphos''^-5000) on nutrient utilization and subsequent performance. Treatments involved a standard broiler diet, a low available phosphorus (LAP) diet and the low available phosphorus diet plus graded levels of phytase at the rate of 500, 750 and 1000 units / kg diet. The groups fed standard broiler diet and low available phosphorus diets supplemented with 750 and 1000 units phytase showed significantly (P<0.01) higher body weight and weight gain. The cumulative feed intake was statistically comparable among the experimental diets at sixth week, whereas, at eighth week it was significantly (P<0.05) lower in LAP diet without phytase than that of other diets. The feed conversion ratio was significantly (P<0.01) improved by the addition of phytase at 750 and 1000 units / kg in comparison to low available phosphorus diet. Graded levels of phytase addition linearly improved nitrogen retention while energy retention was significantly (P<0.01) higher in groups fed 750 and 1000 units of phytase / kg. The addition of 750 and 1000 units of phytase / kg diet significantly (P<0.01) increased the availability of calcium while phosphorus availability was improved by all levels of enzyme 500, 750 and 1000 units / kg. The excretion of phosphorus was significantly (P<0.01) reduced in enzyme supplemented groups. The availability of manganese and zinc was significantly more in enzyme supplemented groups. Tibial ash, serum calcium and serum inorganic phosphorus were significantly (P<0.01) increased by the addition of 750 and 1000 units of dietary phytase / kg both at sixth and eighth week of age. The serum alkaline phosphatase level was significantly (PO.Ol) decreased in the diets supplemented with phytase. Supplementation of phytase had no effect on per cent dressed yield and giblet yield. The per cent R-to-C yield was significantly (P<0.05) higher in groups fed standard diet, LAP diet and 500 units phytase supplemented diet at sixth week. Whereas at eighth week it was significantly (P<0.05) higher in groups fed standard diet and 1000 units phytase added diet. The livability was not influenced by dietary phytase and available phosphorus levels. The net profit per kg live weight at eighth week was 29, 94 and 85 paise higher in groups fed 500, 750 and 1000 units of phytase, respectively in comparison to LAP diet. The results suggested that supplementation of 750 units of phytase per kg in low available phosphorus diets is advantageous for commercial broiler chicken production.
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    ThesisItemOpen Access
    Comparative performance of new hampshire and indigenous naked neck hens in cages
    (Department of Poultry Science, College of Veterinary and Animal Sciences, Mannuthy, 2000) Jayasree, K S; KAU; Peethambaran, P A
    An experiment was carried out at the Kerala Agricultural University Poultry Farm, Mannuthy in order to evaluate the production performance of New Hampshire and Naked Neck hens in cages. Sixty (60) pullets each of New Hampshire (NH) and Naked neck (NN) at the age of 18 weeks were housed at random in identical cages in four replicates each at the rate of 15 birds per replicate and three birds per cage. Layer mash with BIS specifications was fed ad libitum throughout the experimental period. Standard routine management practices were followed in the study. The production performance in cages for five periods of 28-days each were recorded during January to June 1999. The objective of the study was to evaluate and compare the production performance of New Hampshire and Naked Neck hens from 20 to 40 weeks of age in cages. Body weight at 20 and 40 weeks of age in New Hampshire and Naked Neck were recorded individually and the respective mean values were found to be 1675.10 g and 1682.30 g at 20 weeks and 2635.45 g and 2703.65 gat 40 weeks of age. The average age at first egg was 164.50 days in New Hampshire and 164.71 days in Naked Neck hens. The mean ages at 10 and 50 per cent production were 168. 15 and 175.5 days in New Hampshire and 170.35 and 176.55 days in Naked Neck respectively. • ii The mean egg production recorded was 4.15 with 59.28 per cent in New t: ) Hampshire and 4.51 eggs with 64.42 per cent in Naked Neck on hen housed basis " and on hen-day basis 4.16 eggs with 59.42 per cent in New Hampshire and 4.52 eggs with 64.57 per cent in Naked Neck. The highest production was obtained at 31 weeks of age in New Hampshire and Naked Neck birds on hen-housed and hen-day basis. The mean daily feed consumption worked out was 123.06 gin NH and 123.46 g in NN. Feed conversion ratio on the basis of dozen eggs for New Hampshire was 2.60 and it was 2.45 in Naked Neck hens. Egg weight at last three days in each period was individually recorded and the overall mean egg weight for 21 to 40 weeks of age was 50.44 g in New Hampshire and 53.36 g in Naked Neck. The overall mean egg mass per day was 1.60 kg in NH and 1.84 kg in NN. The mean percentages of shell, albumen and ,yolk were 10.17, 58.59 and 31.24 in New Hampshire and 9.41, 57.65 and 32.94 in Naked Neck eggs respectively. The mean shell thickness was 0.44 mm in NH and 0.48 mm in NN eggs. The mean i indices of shape, albumen and yolk were i.34, 0.09 and 0.36 in New Hampshire and 1.32,0.07 and 034 in Naked Neck. The mean yolk cholesterol was 14.54 mg per g of yolk in New Hampshire and 14.46 mg per g of yolk in Naked Neck eggs. The mean Haugh Unit Score was 87.16 in 'New Hampshire and 80.58 in Naked Neck hens. The livability per cent from 21 to 40 weeks of age was 91.66 in New Hampshire and 93.33 per cent in Naked Neck. The feed cost per egg was 226 paise in New Hampshire and 212 paise in Naked Neck hens. 111 Based on the above findings, it is evident that the overall egg weight, egg mass and shell thickness were significantly higher (P<0.05) in Naked Neck birds. The overall mean albumen index and yolk index were significantly higher (P<0.05) in New Hampshire birds. The differences in body weight at 20 and 40 weeks, age at sexual maturity, overall HlR'-J, HDN and its percentages, overall feed consumption, feed conversion ratio, per cent shell, per cent albumen and per cent yolk., shape index, yolk. cholesterol and Haugh Unit Score were non- significant between New Hampshire and Naked Neck. Therefore it was concluded that Naked Neck birds have an edge over new Hampshire birds in egg production, egg weight, egg mass and shell thickness. However, New Hampshire birds had better albumen and yolk percentage. New Hampshire and Naked Neck were similar in characters of body weight, age at sexual maturity, egg production, feed consumption, feed conversion ratio, per cent shell, per cent albumen, per cent yolk, yolk. cholesterol and Haugh Unit Score, when reared in cages. "