Effect of Level of Dietary Calcium-Phosphorus during Growth and Gestation on Calcium -Phosphorus Balance and Reproductive Performance of First Litter Sows

Influence of Dietary Calcium-Phosphorus Levels on Apparent Absorption of Minerals and Nitrogen During Growth and Reproduction in Gilts

“…absorption of both Ca and P during the gestation period with higher Ca-P intake was in agreement with the findings of Nimmo et al (1981) and Kornegay and Kite (1983). An overall increase in the absorption of Ca and P during both gestation and lactation from the finishing period could be due to an increased metabolic need of these minerals during these periods.…”

“…Besancon '19'72\ reported that a higher Ca intake (27 or l5 vs. 10 g/day) decreased the Ca absorption in growing pigs. Nimmo et al (1981) reported that feeding approximately l4OVo of NAS-NRC (1979) recommended Ca-P levels increased the absorption ofboth Ca and P during the gestation period. More information on such interactions in nutrient absorption is essential for formulation of efficient feeding programs.…”

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

“…In contrast, based upon calculations from balance data reported by Nimmo et al (1981a) for gestating gilts 40 to 45 d after breeding, only 6.2% of a 13-g daily Ca intake was absorbed, with 85.2% of the absorbed being retained, and at a daily Ca intake of 19.5 g, 17% of the Ca was absorbed and 95.2% of the absorbed Ca was retained. The Ca:P ratio in the Nimmo et al (1981a) study was 1.3:1 for both Ca-P treatments. In our study, the Ca:P ratio was about 1.5:1 for the low P diet (15.2:10.3, Ca:P) and 1:1 for the high P diet (14.6:14.0, Ca:P).…”

“…The low P-fed sows were more efficient in the retention of P when expressed as a percentage of intake (32.9 vs 28.6%) and as a percentage of the absorbed P (81.2 vs 63.7%). Similarly, Nimmo et al (1981a) reported a slightly higher (nonsignificant) percentage of P absorbed (46.4 vs 48.6%) when a 15 g P intake was compared with a 10 g intake and, contrary to our findings, a slightly higher (nonsignificant) percentage of P retained as a percentage of intake (34.9 vs 36.2%) and of absorbed (72.2 vs 74.5%) P. In contrast to Ca absorption and retention coefficients, which were lower, the above P absorption and retention coefficients reported by Nimmo et al (1981a) were similar to our values. With the exception of intake and fecal P, which increased slightly over parities, there were no significant effects of parity for any of the characteristics measured.…”

“…The National Research Council (NRC)-suggested daily Ca requirement for gestating gilts and sows was reduced (15 to 13.5 g), while the daily P requirement was increased slightly (10 to 10.8 g) from 1973to 1979(NRC 1973, 1979. The majority of the studies conducted have reported no benefit in farrowing performance when higher Ca and P levels were fed (Kornegay et al, 1973;Harmon et al, 1974;Monegue et al, 1980;Nimmo et al, 1981a; 1463 JOURNAL OF ANIMAL SCIENCE, Vol. 57, No.…”