000			03036nab a22003497a 4500
001			67486
003			MX-TxCIM
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008			240506s1975 ilu|||p|op||| 00| 0 eng d
022			_a1525-3163 (Online)
024	8		_ahttps://doi.org/10.2527/jas1975.405851x
040			_aMX-TxCIM
041			_aeng
100	1		_933901 _aBaker, D.H.
245	1	0	_aLysine requirement of growing pigs at two levels of dietary protein
260			_aIllinois (United States of America) : _bAmerican Society of Animal Science, _c1975.
500			_aPeer review
520			_aTwo-hundred-forty crossbred pigs weighing 18 kg initially were assigned to dietary lysine levels ranging from .43% to .91% (.08% increments) at either 16% or 12% dietary crude protein. The dietary protein came from corn, sesame meal and crystalline amino acids. Diets were formulated to contain levels of all amino acids except lysine consistent with the most recent N.R.C. requirement pattern at 16% protein. Lysine addition to the basal diets resulted in a quadratic response in gain, feed intake and gain/feed ratio. Protein level did not significantly affect rate of gain, but feed intake was significantly greater by pigs fed diets with 12% protein than by those fed 16% protein. The interaction between protein level and lysine level was statistically significant for rate of gain. Thus, in the linear area of growth (i.e., the lower levels of lysine) pigs fed the 12% protein diets gained faster than those fed the 16% protein diets. At higher levels of lysine, however, pigs fed 16% protein gained more rapidly than those fed 12% protein. Also, at the lower levels of lysine, gain/feed ratio was similar for pigs at both protein levels, but at higher lysine levels, pigs fed 16% protein gained more efficiently than those fed 12% protein. Using pooled data, dietary lysine requirements for maximal gain were estimated by least squares analysis to be .77% at 16% and .69% at 12% protein. The dietary lysine requirement of growing pigs decreased .02% of the diet for each 1% decrease in the level of dietary protein. This concept was tested using corn-soybean meal diets. A 14% protein diet containing supplemental lysine to bring the dietary level to .73% allowed performance similar to that obtained with a 16% protein diet (.77% lysine) or a 14% protein diet fortified with crystalline lysine to contain .77%.
546			_aText in English
650		7	_95257 _aLysine _2AGROVOC
650		7	_917642 _aGrowth control _2AGROVOC
650		7	_94363 _aSwine _2AGROVOC
650		7	_933860 _aPig breeds _2AGROVOC
650		7	_933769 _aCrude protein _2AGROVOC
650		7	_91173 _aMaize _2AGROVOC
650		7	_94464 _aAmino acids _2AGROVOC
650		7	_930395 _aDiet quality _2AGROVOC
700	1		_933923 _aKatz, R.S.
700	1		_933924 _aEaster, R.A.
773	0		_dIllinois (United States of America) : American Society of Animal Science, 1975. _gv. 40, no. 5, p. 851–856 _tJournal of Animal Science _wG74391 _x1525-3163 (Online)
942			_2ddc _cJA _n0
999			_c67486 _d67478