Digestible phosphorus levels for barrows from 50 to 80 kg

Abstract

-This study was carried out to evaluate the levels of digestible phosphorus in diets for barrows with a high potential for lean meat deposition from 50 to 80 kg. Eighty barrows, with an initial weight of 47.93±3.43 kg, were distributed in completely randomized blocks, with each group given five levels of digestible phosphorus (1.86, 2.23, 2.61, 2.99, and 3.36 g kg −1). There were eight replicates, and two animals per experimental unit. Phosphorus levels did not significantly influence feed intake, weight gain, or feed conversion ratio. Daily digestible phosphorus intake increased linearly as levels of phosphorus in the diet were increased. Phosphorus levels did not significantly influence muscle depth, loin eye area, backfat thickness, or the percentage and quantity of lean meat in the carcass. A linear increase was observed for feeding cost as the levels of digestible phosphorus in the diet were increased, and the level of 1.86 g kg −1 cost 29.4% less when compared with the level of 2.61 g kg −1 . The dry matter, natural matter, the coefficient of the residue, and volatile solids of the waste were not significantly influenced by phosphorus levels. Conversely, it was possible to observe an increasing linear effect for total solids, total phosphorus, and total nitrogen in the waste of animals receiving diets with increased levels of digestible phosphorus. The level of 1.86 g kg −1 , which corresponded to a daily intake of 4.77 g −1 of digestible phosphorus, meets the requirements of barrows weighing 50 to 80 kg.

Markers of bone turnover and biomechanical properties of the third metacarpal bone of growing pigs subjected to the different dietary phosphorus and calcium content

“…In such conditions feed intake by both groups of pigs fed a diet with strong phosphorus and calcium deficiency and excess did not differ from the intake of feed by animals fed a diet with the appropriate content of this ingredient. Similarly, other authors also found no effect of the dietary phosphorus content and feed intake in weaned piglets (Liesegang et al, 2002), growing pigs (Nieto et al, 2016), and poultry (Valable et al, 2018). However, according to some authors phosphorus and calcium deficiency resulted in limiting feed intake (Vier et al, 2019).…”

“…In turn, Gerlinger et al (2019) reported significantly decreased body weight gain in weaned piglets offered a diet with surplus of phosphorus, whereas phosphorus deficiency did not affect body weight gain. Other authors (Hastad et al, 2004;Nieto et al, 2016) found that daily gain and final mass of pigs were not affected by increasing available phosphorus in the diet, regardless of the proportion of Ca : P. Others reported no influence of diets deficient in both calcium and phosphorus (Nicodemo et al, 1998) on animals' growth rate. The reason for lower growth of pigs consuming a diet with low content of phosphorus and calcium was that they are essential for proper muscle and bone growth.…”

Nutritional plans of digestible phosphorus for gilts from 30 to 100 kg

“…Even though most of the soils are deficient in phosphorus and nitrogen, their repeated release into soil causes an accumulation, creating toxic effects on plants and groundwater due to leaching (Carvalho and Zabot, 2012). The most interesting strategy to reduce phosphorus excretion is to improve the nutrient utilization efficiency in animal nutrition by using the appropriate concentrations, according to the requirements of the growing phases (Nieto et al, 2016).…”