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Primary Audience: Nutritionists, Broiler Breeder Personnel SUMMARYThis study evaluated the effects of sources and levels of Se in broiler breeder diets on egg production and Se concentration in eggs. Fifty Cobb 500 hens, 22 wk of age, were individually placed in steel cages and fed a basal diet without Se supplementation for 3 wk. Birds were then provided 5 dietary treatments with 10 replicates of 1 individual hen, which had dietary Se supplied from sodium selenite (inorganic; Na 2 SeO 3 , 45% Se) or from Zn-l-Se-methionine (organic; ZnSeMet, 0.1% Se) as follows: treatment 1, 0.15% Se from Na 2 SeO 3 ; treatment 2, 0.30% Se from Na 2 SeO 3 ; treatment 3, 0.15% Se from ZnSeMet; treatment 4, 0.30% Se from ZnSeMet; treatment 5, 0.15% Se from Na 2 SeO 3 + 0.15% Se from ZnSeMet. Evaluations were conducted in 2 periods of 4 wk each. Experimental diets were prepared through the supplementation of corn-soybean meal diets. Egg production and egg weight were recorded daily, whereas specific gravity was measured twice a week from 25 to 32 wk. In the first period, the hens fed 0.30 ppm of organic Se produced more eggs (P < 0.05), whereas no difference (P > 0.05) in egg production was found in the second period. Period evaluations showed that egg weight was not different (P > 0.05), whereas specific gravity decreased (P < 0.05) and Se concentration in eggs increased (P < 0.05) in the second period, regardless of Se source. A comparison between treatments with single Se sources demonstrated that the concentration of Se in eggs followed the increased levels in the feeds when ZnSeMet was used (P < 0.05). However, the supplementation of a combination of sources (Na 2 SeO 3 and ZnSeMet) produced similar egg Se concentrations.

RESUMO Foi conduzido um experimento com o objetivo de avaliar a formulação de dietas com diferentes perfis protéicos ideais para frangos de corte fêmeas. Foram usadas aves dos cruzamentos Cobb x Cobb 500 e Ross x Ross

Acidulated soy soapstock (ASS) and lecithin (LEC) are by-products from processing soy oil (SO) for human consumption, whereas glycerol (GLY) can be obtained through the transesterification of vegetable oils during the production of biodiesel. These are valuable by-products for poultry feeds that have been underutilized in many parts of the world. One study was conducted to estimate the AME n of ASS, LEC, GLY as well as of their mixture (MIX: 85% ASS, 5% LEC and 10% GLY). Two hundred and sixty Cobb 500 female broilers of 20 days of age were housed in steel wire battery cages in a controlled temperature room for broilers. A completely randomized (energy sources x fat inclusion level) factorial design was applied, with 4 replicates of three birds per treatment. Birds were fed a corn-soybean meal control diet without supplemental fat or with the addition of 2, 4, or 6 % of the four energy sources. Total excreta collection was performed from 26 to 28 days. The AME n values of by-products were calculated using regression analysis as well as by the difference method. The average AME n values calculated by regression analysis were : 9,232, 7,502, 5,447 and 8,404, whereas results with the difference method were: 7,951, 6,579, 3,979 and 8,101 kcal/kg for, in both cases for ASS, LEC, GLY and MIX, respectively. It is concluded that these energy sources can be for broilers and that there are significant differences between the methods used to estimate AME n of fats.

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