Influence of Calcium and Phosphorus on Growth and Skeletal Development of Growing Swine

Abstract

and phosphorus on growth and skeletal development ofgrowing swine. Can. J. Anim. A factorial design with three levels of calcium, three levels of phosphorus, two breeds and both sexes (72 pigs) was employed to study calcium and phosphorus deficiencies and imbalances in swine fed from 22 kg ro 90 kg. Dietary levels of both minerals were 50, 100 and l5OVa rsf National Academy of Sciences-National Research Council (NAS-NRC) recommendations (1968

Plasma calcitonin and parathyroid hormone levels in growing pigs on different diets. II. Low calcium diet

“…A rise in plasma PTH levels is also observed after intravenous infusion of EGTA or EDTA in cows (Blum and Fischer, 1975 ;Sherwood et al, 1966 ;Saeki and Hayashi, 1976 (Ramberg et al, 1976. ) Histological findings in pigs have suggested that a low Ca : P ratio (0.5) induces an increase in parathyroid activity as compared with that observed using a normal Ca : P ratio (1.2) (Nunez, Krook and Whalen, 1976) ; this agrees with a previous observation of Doige, Owen and Mills (1975). In contrast, we found no rise in plasma PTH level with a Ca-P ratio of 0.5 (Pointillart, Garel and Gu6guen, 1978b) (Doige et a/., 1975 ;Horvath and Papp, 1972 ;Stockland and Blaylock, 1973) (Chen, Toribara and Warner, 1956).…”

“…Our experiments in pigs led to the conclusion that CT secretion is more sensitive than PTH secretion to changes in plasma calcium level. Care et al (1968) (Horvath and Papp, 1972 ;Doige, Owen and Mills, 1975 ;Stockland and Blaylock, 1973 Doige, Owen and Mills (1975) In pigs we must also emphasize the importance of the relationships between the plasma concentrations of magnesium and CT already observed (Pointillart, Garel and Gu6guen, 1978b). In the present experiments, during the control period and the last period of the low calcium diet, an inverse relationship was established between magnesemia and plasma CT levels.…”

Níveis de substituição do fosfato bicálcico pelo monobicálcico em dietas para suínos nas fases de crescimento e terminação

“…Boyd et al (1983) verificaram que a disponibilidade de fósforo no milho com alta umidade foi semelhante quando determinada com base na resistência à quebra de osso ou na atividade de fosfatase alcalina como critério de resposta. Por outro lado, Doige et al (1975) observaram que os níveis de fosfatase alcalina no soro apresentam pouco valor no diagnóstico de deficiência de cálcio ou fósforo. Koch & Mahan (1986) e Engstron et al (1985) encontraram efeito linear significativo na concentração de fósforo inorgânico no soro sangüíneo de suínos em terminação recebendo níveis crescentes de fósforo dietético.…”

Plasma calcitonin and parathyroid hormone levels in growing pigs on different diets. I. — High phosphorus diet

“…According to Laflamme and Jowsey (1972), dogs maintained on high phosphorus diet for 10 months exhibited a decrease in plasma phosphate level 12 weeks after the beginning of treatment, whereas plasma calcium level was unchanged. However, serum inorganic phosphate increased in pigs fed over a long period (from 20 to 90 kg ; 3-4 months) (Bayley et al, 1975 ;Doige, Owen and Mills, 1975) ; a trend to hypocalcemia was also observed (Nielsen et al, 1971). A long-term treatment of phosphate supplements in rabbits was without effect on plasma phosphate, but decreased plasma calcium level (Jowsey and Balasubramanian, 1972).…”