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|Title:||Dietary Protein-Lysine-Energy Requirements and Relationships for Weanling Pigs and Dietary Lysine Requirements for Finishing Pigs (Amino Acids, Calories)|
|Department / Program:||Animal Science|
|Degree Granting Institution:||University of Illinois at Urbana-Champaign|
|Subject(s):||Agriculture, Animal Culture and Nutrition|
|Abstract:||Successful weaning of pigs at a young age is very important for the pig industry, however, specific quantative requirements of the early weaned pig for several nutrients have not been precisely identified, in particular, optimum dietary levels of protein, lysine, energy and their relationships. Also, the suggested dietary requirements vary greatly. Therefore, a series of experiments was conducted to determine: (1) the dietary protein-lysine-energy relationships and requirements for maximum rate and efficiency of gain for pigs weaned at 25-30 days of age and (2) the dietary lysine level necessary in diets with two different levels of protein for maximum lean tissue development in ad libitum-fed finishing pigs.
The lysine requirements of weanling pigs averaging 7.4 kg and 29 days of age were estimated to be 1.11, 1.19 and 1.27%, respectively, for diets with 17.5, 19.5 and 21.5% crude protein (CP). For maximum gain/feed, the diet containing 19.5% CP and 1.19% lysine was adequate. However, when pigs were limit-fed, at each level of CP the lysine requirement for maximum N retention or utilization was higher than that for maximum gain/feed of the ad libitum-fed pigs. The dietary lysine requirement of pigs increased 0.04% of the diet for each 1% increase in the level of dietary crude protein ranging from 17.5 to 21.5%.
Pigs averaging 8.6 kg and 30 days of age required CP levels of 17.5 (1.11% lysine), 18.5 (1.15% lysine) and 20.5% (1.23% lysine) in diets with 0, 4 and 8% corn oil added, respectively, for maximum gain and feed efficiency. Or, the requirement could be expressed as the ratio of g of CP to Mcal of metabolizable energy, a value of 57.5. Limiting feed intake increased the respective CP requirements by 2%. Also, the requirements during the first two weeks following weaning was about 2% higher than during the third and fourth weeks period.
Finishing pigs required 0.53 and 0.57% lysine in diets with 11 and 13% CP, respectively, for maximum gain, gain/feed and carcass leanness. Maximum gain/feed was obtained with the diet containing 13% CP and 0.57% lysine.
Thesis (Ph.D.)--University of Illinois at Urbana-Champaign, 1985.
|Date Available in IDEALS:||2014-12-15|