Lysine requirements of pigs from 2 to 7 kg live weight

Abstract

Thirty-two male pigs were used to investigate the effects of nine levels of dietary lysine ranging from 0-41 to 1-30 g lysine per MJ gross energy (GE) on the performance of pigs weaned at 1 to 2 days of age and growing between 2 and 7 kg live weight. The nine dietary lysine treatments, which contained similar levels of GE and balance of essential amino acids, were offered to the pigs at a common feeding level of 2-0 MJ GE per kg metabolic live weight (M 075 ) per day. Growth performance and protein deposition rates increased linearly with increasing dietary lysine content up to about 0-97 g lysine per MJ GE and remained relatively constant thereafter. The response of protein deposition (PD, g/day) in the whole body of pigs to dietary lysine (L, g lysine per MJ GE) was described by three models. The respective regression equation for the quadratic function was PD = -14-23 + 87-66 L -36-00 L 2 and maximum protein deposition occurred at 1-22 g lysine per MJ GE. The rectilinear model, which had an ascending linear phase (PD = 1-49 + 40-10 L, R 2 = 0-98, P < 0-001) and a horizontal component representing a mean protein deposition rate of 39-7g/day revealed that maximum protein deposition occurred at 0-95g lysine per MJ GE. Finally, application of the asymptotic model also revealed a highly significant equation: PD = 43-40 -79-99 X 0-0711 1 , R 2 = 0-94, P < 0-001; which indicates a dietary requirement of 1-07 g lysine per MJ GE assuming that the dietary requirement was estimated at 0-90 of the asymptote maximal value. The results indicate that the dietary lysine requirement for pigs during the first 3 weeks of life appears to have changed little over the past 20 years despite substantial changes in genotype.

Energy and amino acid content in phase 1 nursery diet: piglet performance and body chemical composition

“…Trindade Neto et al (2001) verified major efficiency of lysine utilization for muscle protein synthesis of piglets when total lysine level was elevated to 1.25%. These observations confirmed the results by Susenbeth (1995) and Auldist et al (1997) showing that an increase in dietary lysine levels stimulates the development of protein fractions or compartments of the body. However these authors did not determine an optimum dietary limit.…”

“…Percentages of water and fat components on the carcass were similar to those found by Auldist et al (1997) in a study with piglets at 7 kg of body weight and diets changing from 1.37 to 1.74% of lysine. Trindade Neto et al (2001) verified major efficiency of lysine utilization for muscle protein synthesis of piglets when total lysine level was elevated to 1.25%.…”

The influence of litter size on milk production of sows

“…As daily milk yield is relatively constant during the 3rd and 4th weeks of lactation (Toner et al, 1995), milk yield estimated by the deuterium oxide procedure between day 24 and 28 of lactation should be representative of daily milk production between day 14 and 28. Where artificially reared piglets have been offered diets of similar energy and amino acid contents to those in sow milk, the food efficiency for pigs between 1 and 4 weeks of age is closer to 1-0 g milk dry matter: 1-0 g piglet growth (Hodge, 1974;Auldist et al, 1997). This value for the conversion efficiency of milk dry matter into piglet growth is greater than earlier estimates of 0-70, 0-86 and 0-82 calculated by Lewis et al (1978), van Kempen et al (1985) and Noblet and Etienne (1989) respectively for sucking piglets between 7 and 25 days of age.…”

Níveis de lisina para leitoas dos 6 aos 16 kg com alto potencial para deposição de carne magra na carcaça

“…Segundo Auldist et al (1997), o melhoramento gené-tico ocorrido nos últimos anos foi um dos fatores determinantes em mudanças significativas nas exigências de lisina para os suínos. Assim, esse trabalho foi conduzido com o objetivo de determinar a exigência nutricional de lisina para leitoas com alto potencial genético para deposição de carne magra na carcaça, dos 6 aos 16 kg.…”