Phosphorus in Swine. II. Influence of Dietary Calcium and Phosphorus Levels and Growth Rate on Serum Minerals, Soundness Scores and Bone Development in Barrows, Gilts and Boars

Abstract

NRC-suggested levels of Ca and P, and (4) maximization of bone development occurred when pigs were fed 125% P in combination with 125% Ca. (

Metacarpal and Metatarsal Dimensional, Mechanical and Mineral Characteristics of Crossbred Boars as Influenced by Nutrition and Age

“…In another paper in this series, Lepine et al (1985) found that elevating mineral and vitamin intake above that recommended by NAS-NRC (1979) had no effect on toe, foot and leg development and resulting structural soundness, which agrees with previous reports (Grondalen 1976;Reiland 1978;Nimmo et al 1980b;Kornegay and Thomas 1981;Kornegay et al 1981Kornegay et al , 1983Calabotta etal. 1982;Arther et al 1983a …”

“…Changes gay et al (1981) and Kesel et al (1983) reported increased metacarpal breaking strength resulting from l50%o NAS-NRC Ca and P recommendations. The lack of a strong mineral-vitamin level affect on metacarpal or metatarsal elasticity in the present study agrees with the findings of Kornegay et al (1981) but disagrees with those of Kesel et al (1983). who observed increased metacarpal elasticity with elevated (lSOVo NAS-NRC) Ca and P levels.…”

Available phosphorus levels for 95 to 120 kg barrows genetically selected for lean gain

“…Kornegay & Thomas (1981) reported an increase in serum inorganic phosphorus due to the increase of P in the diet as well as an increased level of serum inorganic phosphorus in pigs with fast growth rate compared with those with low growth rates, when evaluating different levels of calcium and phosphorus and growth rates of castrated male pigs and gilts, from 50 to 107 kg. Reinhart & Mahan (1986) also observed a linear increase in serum inorganic phosphorus at the end of a 42-day experimental period by increasing the concentration of phosphorus in the diet and a linear decrease in serum phosphorus content by increasing the dietary Ca:P ratio for 54 to 86 kg barrows and gilts.…”

Phosphorus in Swine. IV. Influence of Dietary Calcium and Phosphorus and Protein Levels on Feedlot Performance, Serum Minerals, Bone Development and Soundness Scores in Boars

“…Blood samples were taken from the anterior vena cava just before the end of each trial. Pad and structural soundness scores were assigned as described by Kornegay and Thomas (1981) when boars weighed about 50 kg and again at the end of the trials. After thawing, the right foot, which had been removed at slaughter and frozen, was examined and given an overall score from 1 to 5.…”

“…However, the relationship of bone mineralization during growth and development to structural soundness is not clear. Kornegay and Thomas (1981) reported no influence of dietary Ca and P level fed during growth and development on structural soundness scores for barrows, gilts and boars at a / weight of 100 to 115 kg, even though breaking load and bone ash generally increased as the level of Ca and P increased. A similar finding was reported for boars (Nimmo et al, 1978).…”