An Investigation Of Dietary Protein And Energy Levels And Its Effect On The Reproductive Performance In Yorkshire Gilts

2001 An Investigation of Dietary Protein and Energy Levels and Its effect on Productive Performance in Yorkshire Guts ABSTRACT The main objective of this thesis was to investigate the present status of practical dietary protein and energy levels and reproductive performance of sows, and then to study the effect of? dietary protein and energy levels on reproductive performance of sows. 1. Investigation. Nutrient levels (protein and energy) and reproductive performance of sows from eight representative Pig Farms in Hunan Province were obtained by making a questionnaire and on梩he spot investigation. It was indicated that dietary protein and energy levels of sows were abit low, especially energy levels of gestation and lactation sows (12. 12?2. 75and 12. 96?3. 92MJ/kg, respectively), were 4. 71?0. 29% and 2. 06-8. 82% lower than NRC(l998) recommended, respectively ; and reproductive performance of sows were not equilibrium, total litter size were 9.88 to 10. 54, and only 25 percent of those Pig Farms investigated reached the standard of Canada Yorkshire, 10. 5 pigs born; average individual weight born was 1. 31 to 1. 45kg; Weaning piglet weight at d 28 was 7 to 8kg, but decreased 2. 4?4. 63% than the set standard of Canada Yorkshire, 8.2kg. 2. Effect of dietary protein and energy levels on reproductive performance of Yorkshire guts. The effect of different dietary protein and energy levels in gestation and lactation (d 28) diets on reproductive performance was evaluated using 36 Yorkshire gilts, and the mating date and parent reproductive performance were similar. The ratio of dietary protein and energy is basically steady, and the diets with three (High, Low, Original) different protein and energy levels were designed for pregnant and lactating sows, respectively. During pregnant and lactating period, Exp.groupl, Exp. group2 and Control group were offered low gestation and lactation diets, high gestation and lactation diets, and original gestation 2001 and lactation diets, respectively. Sows were fed restricting during pregnant period, and fed ad條ibitum during lactating period. The result showed that: ~ The significant effect of dietary protein and energy levels during pregnant period on litter size(P<0.05).Numbers of pigs born and pigs born alive of Exp. groupl (Low) reduced 2. 4 head. 25. 53%, 2.75 head. 13.46% and 1.0 head. 35.48%, 1.75 head. 10. 52% than that of Exp.group2 and Control group (P<0.05), respectively, but there was no significant difference between Exp.group2 and Control group (P>0. 05). @~ No significant difference was deserved among gestation diets with piglets weight born (P>0. 05) (1. 39, 1.40, 1. 38kg). ?Average daily gain of pigs before weaning was not influenced by gestation and lactation diets (P>0.05)~ and that of Exp.groupl. Exp.group2 and Control group were 211.47. 224.75 and 222.62 g/d at d 0?8,respectively. But protein and energy levels of gestation and/or lactation diets significantly affected litter weight at d 0,21,28 (P<0.05), and Exp.groupl significantly reduced than that of Exp. group2 and Control group (...