Body composition and net and dietary requirements of macrominerals (Ca, P, Mg, Na and K) of genetically selected Caracu (CaS) and Nellore (NeS) for yearling weight (378 days of age) as well as of ordinary Nellore (control; NeC) were investigated in this trial. Fifty-six young bulls averaging 18 months of age were used. Twelve animals were slaughtered after an adaptation period and were used as reference. The 44 remaining animals, 16 NeS, 16 CaS and 12 NeC, with initial average […]

The objective of this trial was to determine the body composition and nutritional requirements of macrominerals for Morada Nova sheep. Thirty lambs averaging 15 kg of initial body weight (BW) and 70 days of age were used in this study. Six lambs (reference-animals) were slaughtered with 15 kg of BW to determine the initial body composition using the comparative slaughter methodology; six other lambs were slaughtered with 20 kg of BW (intermediary slaughter) and the remaining 18 lambs were distributed […]

Seven hundred and twenty and six hundred chicks, males and females, from 22 to 42 and from 43 to 53 days old, respectively, fed a basal diet (3100 and 3210 kcal ME/kg and 19.6 and 18.6% CP) deficient in sodium (0.017%), supplemented with NaCl, corresponding to the levels of .077, .137, .197, .257 and .317% of total sodium were used to determine the sodium requirements for broilers during the growing and final phases. A completely randomized design, in a 5×2 […]

The aim of this experiment was to verify the sodium levels and electrolyte balance of diets for commercial laying hens on the first and second production periods. Two experiments with 112 days each, divided in four periods of 28 days, were carried out. One hundred and sixty Lohmann laying hens (25 weeks old) and 160 Babckok forced molting laying hens (80 weeks old), in the first and second experiments, respectively, were used. The laying hens were assigned to a completely […]

The effects of different levels of roughage on intake and apparent absorption of calcium (Ca), phosphorus (P), sodium (Na), potassium (K) and magnesium (Mg) were studied. Forty Holstein x Zebu calves, with initial average live weight of 60 kg, allotted to a completely randomized design, were fed concentrate and chopped coastcross (Cynodon dactylon) grass hay ad libitum in the following levels: 10; 25; 40; 55 e 90%, on a DM basis. The coefficients of apparent absorption were obtained by one […]

Eight hundred Avian Farms chicks (50% males; 50% females) from 1 to 21 days of age, averaging 40.5 g, fed a basal diet (3.000 kcal ME/kg and 21.1% CP) deficient in sodium (0.017%) and supplemented with NaCl, corresponding to the levels of 0.077, 0.137, 0.197, 0.257 and 0.317% total sodium, were used to determine the sodium requirement. A completely randomized design, in a 5×2 (sodium levels x sex) factorial design, with four replicates and 20 chicks per experimental unit, were used. […]

Two experiments were carried out to determine the sodium (Na+) and chloride (Cl–) requirements for broilers in the pre-initial phase (1 to 7 days of age) and the best electrolyte balance of the diet. In each experiment 1500 broilers from Cobb strain were allotted to a completely randonmized design with six treatments, five replicates and 50 birds per experimental unit. The treatments used in the two experiments consisted of diets with levels on 0.10, 0.15, 0.20, 0.25, 0.30 and 0.35% […]

An experiment was carried out to verify the effect of different levels of sodium and phosphorus (P) on the performance, eggshell quality and on some blood constituents of 144 laying hens Hy-Line W36, aged 60 weeks, allotted to 36 experimental units with four hens each. A randomized experimental block design was used in a factorial arrangement (3 x 3), sodium levels (.16, .20 and .24%) and phosphorus levels (.35, .45 and .55%), totalizing nine treatments, two blocks with two replicates […]