000			02926nab a22003257a 4500
001			67492
003			MX-TxCIM
005			20240531233258.0
008			240507s1976 ilu|||p|op||| 00| 0 eng d
022			_a1525-3163 (Online)
024	8		_ahttps://doi.org/10.2527/jas1976.421114x
040			_aMX-TxCIM
041			_aeng
100	1		_933939 _aWoerman, R.L.
245	1	0	_aLysine requirement for reproduction in swine
260			_aIllinois (United States of America) ; _bAmerican Society of Animal Science, _c1976.
500			_aPeer review
520			_aTwenty-four Yorkshire × Landrace gilts were used in an experiment to determine the lysine requirement for reproduction. L-lysine·HCl was added to a fortified corn diet to attain four lysine levels of .2, .3, .41 and .55% lysine (equal logarithmic spacing). The diets were fed at the rate of 1.82 kg daily before mating and during two reproductive cycles. During each 3-week lactation, all animals were fed the same 13% crude protein corn-soybean meal diet. Littersize and feed intake were standardized during both lactations. Nitrogen balance trials were conducted before mating and during each trimester of pregnancy. As dietary lysine increased, urinary nitrogen decreased and nitrogen retention increased linearly (P<.005). Beyond .41% dietary lysine, the urinary excretion decrease and the nitrogen retention increase were minimal. Similarly, plasma urea nitrogen decreased and plasma lysine increased (linear component was significant at P<.005) as dietary lysine levels increased with inflections in the response curves beyond the .3% lysine level. Lactation milk production, milk composition and nursing pig weights were affected by dietary lysine levels fed during pregnancy. Milk yield, milk solids and nitrogen composition were near maximum in those sows fed .41 % lysine. Pig weights were near maximum at .3% lysine. There were no differences in nitrogen retention among the treatments during day-15 to day-20 of lactation, but nitrogen retention less milk nitrogen was mínimal for the sows fed .41 % lysine. Considering all the parameters, it was concluded that .41 % lysine satisfied the requirements for reproduction. When lysine is supplied by corn and soybean meal in a swine diet, a level of .43% lysine (7.8 g/day) would allow for some undigested lysine and still meet the lysine requirement.
546			_aText in English
650		7	_94363 _aSwine _2AGROVOC
650		7	_99820 _aReproduction _2AGROVOC
650		7	_95257 _aLysine _2AGROVOC
650		7	_94464 _aAmino acids _2AGROVOC
650		7	_933890 _aNitrogen balance _2AGROVOC
650		7	_92912 _aNitrogen _2AGROVOC
650		7	_99626 _aUrea _2AGROVOC
700	1		_933940 _aSpeer, V.C.
773	0		_dIllinois (United States of America) : American Society of Animal Science, 1976. _gv. 42, no. 1, p. 114–120 _tJournal of Animal Science _wG74391 _x1525-3163 (Online)
942			_2ddc _cJA _n0
999			_c67492 _d67484