Effect of Early Feed Restriction on Broiler Performance, Blood and Carcass Parameters Under Summer Conditions.

Abstract

his research work was designed to study early feed restriction effects on broiler production during Egyptian summer. One hundred ninety eight unsexed Cobb-500 broiler chickens were divided to six experimental treatments with three equal replications. All chicks were free fed starter diet during the first week. In the second week, the chicks in the control group were fed the starter diet ad libitum, but feed intake of the other experimental groups were restricted at levels of 20, 25, 30, 35 and 40%, respectively from the feed intake of the control group. At 2 weeks of age, one bird from each replicate was sacrificed to obtain blood samples. All the experimental chicks were free fed basal grower diet from 14 to 42 days-old. Broiler performance was evaluated by live weight, feed consumed and feed conversion. Carcass parameters and some blood constituents were also measured. The current results showed that feed restriction improved the marketing live body weight, feed utilization and economical efficiency of treated broiler chicks, with no negative effect on either carcass traits or blood parameters. It could be concluded that early feed restriction during the second week of life up to 35% of ad libitum feeding can enhance the marketing weight and improve the feed conversion of broilers as compared to the control treatment under summer conditions in Egypt.

Responses of Broiler Chicks to Starvation Period Lengths and Effects on Growth Performance, Digestibility, Carcass Yield, Blood Indications and Economics Short Title: Feed Restriction and Its Effects on Broiler Performance

“…In agreement with our results, Kumar et al ( 2015) and Sherif and Mansour (2019) reported that feed regimen had no negative effect on activity of liver enzymes (AST and ALT) of broiler chicks. Similar results were obtained by Rajman et al, (2006) as they determined that activities of Creatinine and AST values were higher in full fed chickens than restricted feed chickens.…”

“…Also, Lanhui et al, (2011) concluded that low concentration of T3 and high concentration of T4 had found in restricted-feed broilers. In addition, feed restriction decreased broiler plasma levels of both T3 and T4 at 35 day of age (Ghazanfari et al, 2010), but plasma T4 increased at 21 d of age (Rezaei and Hajati , 2010).On the contrary of our finding, Sherif and Mansour(2019) found that the high levels of corticosterone were recorded with the high levels of feed restriction percent (30, 35 and 40% from free feeding) comparing to their control. Differences in corticosterone concentration in broiler plasma may be depend on regulation of blood glucose levels (Hockhing et al, 1996;De Jong et al, 2002 ;Mench, 2002), or could be attributed to growth of chickens, duration and intensity of feed restriction (Attia et al,2017).…”

“…They detected that the growth rate of broilers was fewer in the restricted group than the control. Also, Njoku et al ( 2012) and Sherif and Mansour (2019) found the same. Chiemela Peter et al, (2015) indicated that broiler chicks with thirty percent withdrawal feed recorded significant decrease in weekly weight growth (WG) compared with broiler chicks fed full feed.…”

Effect of Feed Withdrawal and Progut on Broiler Performance, Carcasses Traits and Blood Parameters

“…Our results agree with those of Sherif and Mansour [36] who observed that broiler reared under feed withdrawal did not effected on plasma total protein, albumin, globulin, triglycerides and cholesterol of broiler chicks compared with the control group. Shafiei, et al [26] found that plasma globulin; cholesterol and triglyceride values did not affected by used feed withdrawal with broiler chicks.…”

“…Our results agree with those of Zukiwsky, et al [19] who observed that broiler exposed feed restriction had no effect on carcass parts percentage compared with control group. Sherif and Mansour [36] observed that broiler reared under feed withdrawal did not effected on carcass parts percentage. Van Der Klein, et al [16] showed that carcass and parts percentage on broiler chicks did not significantly affected by feed restriction.…”