Mineral Balance Studies with the Baby Pig: Effects of Dietary Phosphorus Level upon Calcium and Phosphorus Balance

Abstract

Calcium and phosphorus balance studies were conducted on 29 baby pigs receiving a synthetic milk diet containing phosphorus levels of 02 04 05 06 0.7 and 0.8% with 0.8% calcium. Growth rate, food intake and mineral 'retention were greatly depressed in pigs receiving 0.2% of phosphorus. Increasing dietary phos phorus levels to 0.5% resulted in increased total phosphorus retention (g) and per centage phosphorus retention. Increasing dietary phosphorus levels beyond 0 5% did not increase phosphorus retention (g) but decreased percentage phosphorus retention Dietary phosphorus levels below 0.5% resulted in reduced calcium retention (g) whereas increasing dietary phosphorus levels above 0.5% did not affect calcium bal ance. The dietary phosphorus requirement for optimal utilization of calcium and phosphorus is therefore about 0.5%.

Phosphorus in Swine. VI. Utilization of Nitrogen, Calcium and Phosphorus and Reproductive Performance of Gravid Gilts Fed Two Dietary Phosphorus Levels for Five Parities

“…Results reported by Miller et al (1964) stated that P retention, when expressed as a percentage of the absorbed, was significantly decreased in baby pigs fed low levels of P (below .50%), which disagrees with the findings in this study. However, when P levels were greater than .50%, Miller et al (1962) reported no significant differences for P retention.…”

Effect of Various Levels of Dietary Calcium and Phosphorus on Performance, Blood and Bone Parameters in Growing Boars

“…The increasing concentrations of serum P with increasing concentrations of dietary P are similar to findings of Miller et al (1964) and Bayley et al (1975). Serum P concentrations generally respond in a positive linear fashion with increasing levels of dietary P. A typical pattern for serum phosphorus is one in which levels appear to peak at approximately 1 to 2 weeks of age, then fall steadily to approximately 7.0 mg/100 ml at 5 months and remain constant thereafter (Ullrey et al, 1967).…”

Avaliação das perdas endógenas e das exigências de fósforo, por meio da técnica da diluição isotópica, para suínos em crescimento

“…Este comportamento está em consonância com os dados de MILLER et al (1964), em pesquisa com suínos recém-desmamados, e os de FERNANDEZ (1995a), com leitões em crescimento, ao observarem aumento na ingestão de fósforo, com o incremento dos níveis deste mineral na dieta, variando de 0,4 a 0,8% de P.…”

“…Este valor é praticamente o mesmo obtido, levando em consideração técnica da diluição isotópica para avaliação das perdas endógenas (38,58 mg P/kg peso/dia), o que reforça o balanço de P, como importante indicativo Tabela 2 -Valores das variáveis em função das dietas experimentais Plasm P na determinação da exigência deste mineral para suínos. Com relação à absorção de P, observou-se resposta linear positiva com o consumo deste mineral, equação: Ŷ = -35,925 + 0,7888X; R 2 =0,9472; P<0,01, o que está de acordo com os resultados observados nos trabalhos de MILLER et al (1964), VIPPERMAN JR., et al (1974), BELLAVER et al (1983) e FERNANDEZ (1995a. Já o coeficiente de absorção do P apresentou resposta quadrática ao consumo de P equação: Ŷ = -0,1068 + 0,0064X -0,000013X 2 ; R 2 =0,70; P<0,01.…”