Response of broiler chickens to calcium and phosphorus restriction: Effects on growth performance, carcase traits, tibia characteristics and total tract retention of nutrients

Abstract

This study evaluated the effect of dietary calcium (Ca) and available phosphorus (aP) restriction on growth performance, nutrients retention (ATTR), serum metabolites, and tibia in broiler chickens. A total of 720 one-day-old Ross-308 broilers were used in this study. Broilers were fed with 0 (control), 10 (L 1 ), 20 (L 2 ), and 30% (L 3 ) aP-deficient starting (ST) diets during 1-10 days. In ST period, control included 6 and others included 18 replicates of 12 chicks. In post-starter (PST) period, control was still fed with standard diets, while restricted groups were divided into 3 groups and fed with L 1 , L 2 , and L 3 diets. Each PST treatment included 6 replicates of 12 chicks. Data were analysed using a completely randomised design in a 1 (control)þ3 Â 3 factorial arrangement. Factors included aP levels in ST and PST diets. Results showed that L 3 diet decreased feed intake and weight gain but increased ATTR of Ca in starter phase in compare with control group (p<.05). Retarded growth of birds was compensated in post-starter phase. The Ca, P and ALP levels in blood serum were not significantly influenced by aP levels on day 10 and day 42. The ATTR of Ca and tP on day 42, were higher in birds fed L 3 diets than L 2 or L 1 groups (p<.05). The main effect of L 3 group in both ST and PST, decreased (p<.05) tibia ash, Ca, and P in compare with L 1 group. Main effect of post-starter L 3 group had lowest femur breaking strength (p¼.007). In general, restriction in dietary aP increased nutrients ATTR, impaired bone mineralisation and strength without affecting growth performance. HIGHLIGHTSPhosphorus is one of the most important environmental pollutants that is excreted through broilers manure. Birds exposed to aP and Ca restriction increased the retention of these minerals. Dietary aP and Ca restriction impaired bone mineralisation and strength.

Effect of Dietary Mineral Content and Phytase Dose on Nutrient Utilization, Performance, Egg Traits and Bone Mineralization in Laying Hens from 22 to 31 Weeks of Age

“…Previous works, where dietary Ca and P levels were similar to those evaluated in this research, showed contradictory results. Some studies observed that an increase in the dietary level of Ca and P did not lead to relevant modifications of these minerals in the blood [ 29 , 32 , 33 ]. However, Sari et al [ 27 ] reported that a decrease in the P level of the diet led to a clear decrease in the blood P level of the hens (8.01 vs. 4.10 mg/dL), but without modifying the serum Ca level.…”

Effect of replacement different methionine levels and sources with betaine on blood metabolites, breast muscle morphology and immune response in heat-stressed broiler chickens

“…b Three other basal diets were also prepared with L-Met. c Vitamin premix provided per kilogram of diet: vitamin A (retinyl acetate), 15,000 U; vitamin D3, 5000 U; vitamin E (DL-a-tocopheryl acetate), 80 mg; vitamin K, 5 mg; thiamine, 3 mg; riboflavin,10 mg; pyridoxine, 5 mg; vitamin B12, 0.02 mg; niacin, 70 mg; choline chloride, 1800 mg; folic acid, 2 mg; biotin, 0.4 mg; pantothenic acid, 20 mg. conversion ratio (FCR) was calculated for each period by dividing FI by body weight gain (BWG), taking into account the mortality weights (Imari et al 2020).…”

Consequences of varying dietary calcium and phosphorus levels on lipid profile, antioxidant and immunity parameters of growing Egyptian geese

“…Phosphorus serves the activities of the immune system and promotes a healthy microbial environment in the gastrointestinal tract and acts as a buffer to possible pathogens (Charlotte et al 2015). During the starter period of broiler chickens, body weight and gain as well as feed intake in the 30% available P deficient group were lower than that of the normal group (Imari et al 2020). But, the levels of Ca, P and alkaline phosphatase in blood were not significantly affected by available P levels on days 10 and 42 (Imari et al 2020).…”

“…During the starter period of broiler chickens, body weight and gain as well as feed intake in the 30% available P deficient group were lower than that of the normal group (Imari et al 2020). But, the levels of Ca, P and alkaline phosphatase in blood were not significantly affected by available P levels on days 10 and 42 (Imari et al 2020). It has been concluded that the levels of available P in diets of modern broiler chickens can be reduced by 20% (Delezie et al 2015).…”