Estimation of the Lysine Requirements for High-Lean Growth Pigs
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چکیده
feed intake produced 2.91 2 1.61 more live pigs from Parity 1 to 3 than those developed with ad libitum access to feed. Gilt weight and backfat at 135 days of age affected the likelihood that gilts farrowed a Parity 1 litter. The effect depended on genetic line and development regimen. Each 10 lb increaseldecrease in weight from the mean weight of 248.7 lb was associated with an increaseldecrease of .03 1 + 0.014 in the likelihood a L45 X gilt-developed with restricted feed intake farrowed a P1 litter. Weight had no effect on the likelihood of producing a Parity 1 litter for L45 X gilts developed with ad libitum access to feed or LW x LR cross gilts developed with either feeding regimen. Backfat at 135 days affected the likelihood that a LW x LR gilt produced a Parity 1 litter, but did not affect L45 X gilts. The effect was more than twice as large for LW x LR gilts developed on the restricted feeding regimen (increaseldecrease of 0.078 + 0.024 increaseldecrease of 0.10 in deviation in backfat from the mean backfat of 0.79 in) than those developed with ad libitum access to feed (increaseldecrease of 0.033 2 0.016 per increaseldecrease of 0.10 change from the mean backfat of 1.16 in) Parity 1 sow weight, but not backfat, litter size, or litter weaning weight, affected whether a sow produced a Parity 2 litter. The average sow lost 91.8 lb from farrowing to weaning of her Pality 1 litter. Each ii~creaseidecrease of 10 lb froin the rneail weight loss \.;as associated with a decreaseiii~crease of 0.018 2 0.007 in the likelihood of produciilg a Parity 2. The likelihood of ploduciilg a Paiity 3 litter was not affected by any trait rneasured in Parity 2 sows. profeiiori in the-4ninial Sii?11ce Il?partm?nt. L l a t t h ? ~ ~ t?ihnliians at the S~vint. Research Farm. Roman LIor?no is a graduate stude~lt and res?arih t ~ h-niiian in the .klimal Scieni? D?partm?nt. The lysine requirements (total basis) for high-lean growth potential barrows and gilts raised to maximize growth below the requiren~ent, while the other 2 dietary treatments provided lys above the requirement. The lysine regimen (requirement) to maximize growth performance of barrows and gilts appears to be approximated by 1.14%, 1.04%, 0.94%, and 0.86% total lysine, respectively, but greater dietary lysine concentrations (similar to the greatest lysine regimen) may be …
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