| The research was conducted to determine the scientific feeding measures for Cherry Valley ducks, and establish reasonable avian influenza programs and effective disease control methods in practice. The reproductive performance of late-phase duck breeder and economic benefit were promoted by improving feed formula for duck breeders during late laying period, and large-scale feeding technology was also established, offering some information for healthy breeding and efficient development for high quality meat-type ducks.Research1:Based on many years of the company’s feeding experience combined with related basic theory, a set of scientific feeding measures for Cherry Valley ducks and duck breeders was established.Research2:(1) Two hundred1-day-old ducks without immunization were used. Sixteen ducks were randomly selected to collect blood every other day for analysis of maternal avian influenza. Sixteen blood samples were collected from carotid artery (<10days old) or leg vein (>10days old), and prepared as a1%red cell suspension for detection of antibody levels. The results indicated that it was appropriate to immunize the ducks for the first time at5-7d.(2) To determine the effect of first immunization age on immune efficacy, sixty-four1-day-old ducks were randomly divided into4groups. Group A was the control without immunization, every bird in Group B, C and D was subcutaneously injected with0.5mL of bird flu vaccine at3,6and9days of age, respectively. The blood was collected every4days from12days of age, to detect antibody levels. The result showed that the antibody level was highest when the ducks was immunized the first time at6days of age.(3) To determine the effect of vaccine dosage on immune efficacy, forty-eight6-day-old ducks were randomly divided into3groups with16ducks per group, and subcutaneously injected with bird flu vaccine at a dose of0.3,0.5and0.7mL per bird, respectively. The blood was collected every4days from12days of age, to detect antibody levels. The result showed that0.5mL per bird was more appropriate. Research3:According to the epidemic disease prevention rules for Cherry Valley ducks combined with our experience in dealing with common diseases of meat-type ducks, a comprehensive set of epidemic disease prevention practice was developed. According to the circumstance that contagious diseases of poultry were easy to prevent but difficult to cure, the principle of prevention first was seriously implemented. Comprehensive epidemic prevention measures were taken to maximally control the occurrence, prevalence and spread of common, frequently occurring and some malignant diseases that jeopardize duck production.Research4:T o investigate the effect of feed nutrient level on feed cost and performance of late-phase duck breeders, two flocks of50-wk-old Cherry Valley duck breeders were used. The birds in the control group were fed basal diet, and those in the trial group were fed regulated diet. The laying rate, egg weight, qualified rate of hatching eggs and hatchability between the two groups were compared. The experiment continued until the duck breeders were culled. The result showed that the formula regulation reduced the cost per ton of feed by53yuan. The improvement of feed formulation reduced average daily feed intake from245g to226g.6160kg of feed was saved during the20-wk trial period, so the cost was reduced by14784yuan as calculated by2.4yuan/kg of feed. Feed intake reduction did not influence performance, but effectively controlled the body weight of duck breeders on the contrary. There were some improvements in performance of duck breeders. The average laying rate was increased by0.5%, egg weight reduced by3.6g, qualified rate of hatching eggs increased by0.5%, and hatchability increased by0.66%compared to the control group. |
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