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  • Gomes, Paulo Cezar  (4)
  • 2000-2004  (4)
  • 1
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 29, No. 6 ( 2000-12), p. 1743-1749
    Abstract: With the objective to determine the tryptophan nutritional requirements for male and female broilers, during the initial phase, 800 male and female chicks, from 1 to 21 days of age, with average initial weight of 44.7 and 44.6 g, respectively, were used. The birds received a deficient tryptophan basal diet (.180%). A completely randomized blocks experimental design, in a 5 x 2 factorial arrangement (treatment x sex), with four replicates per sex and 20 chicks per experimental unit, was used. The treatments consisted on a basal diet supplemented with five tryptophan levels (0, .015, .030, .045, and .060%). Chick's performance was evaluated, and the tryptophan requirement values were estimated by means of the polynomial regression models and LRP. The tryptophan true digestibility coefficient of the basal diet was 90.33%. The supplementations with L-tryptophan influenced the males weight gain, however, there was no effect on the feed: gain, suggesting a minimum recommendation of .212 and .195% for total tryptophan and digestible, respectively. However, for the females, the supplementations with L- tryptophan influenced the weight gain and the feed: gain, suggesting a minimum recommendation of .208 and .191% for total and digestible tryptophan, respectively.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2000
    detail.hit.zdb_id: 2078814-9
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  • 2
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 31, No. 3 suppl ( 2002-06), p. 1409-1417
    Abstract: A serie of experiments was carried out with the objective to determine the nutritive value of nine poultry by-product meal and six feather meal for chickens. Four different methodologies were used to determine the values of N corrected apparent (AMEn) and true corrected (TMEn) metabolizable energy, where the traditional method was used with chicks and cocks and the Sibbald method was used with roosters and cecectomized cocks. The estimated AMEn and TMEn values of viscera meal ranged from 3,051 to 3,621 and from 2,866 to 3,583 kcal/kg, respectively. Feathers meal values ranged from 2,952 to 3,629 and from 2,703 to 3,671 kcal/kg for AMEn and TMEn, recpectively. Among the methodologies to determine the feeds energy, the correlations were low, so the differences on the feeds energy values were due to the methodology used.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2002
    detail.hit.zdb_id: 2078814-9
    Location Call Number Limitation Availability
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  • 3
    Online Resource
    Online Resource
    FapUNIFESP (SciELO) ; 2001
    In:  Revista Brasileira de Zootecnia Vol. 30, No. 3 suppl 1 ( 2001-06), p. 1044-1051
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 30, No. 3 suppl 1 ( 2001-06), p. 1044-1051
    Abstract: 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 5x2 (sodium levels x sex) factorial design, with four replicates and 20 chicks per experimental unit, were used. Weight gain, feed intake, feed:gain ratio, adrenal absolute weight and relative weight, carcass yield and carcass dry matter were evaluated, and the requirements were estimated by means of the polynomial regression models. The sodium supplementary levels affected weight gain, feed intake, feed:gain ratio and adrenal relative weight in both sexes, with no significant effect of the studied levels on the adrenal absolute weight, carcass yield and carcass dry matter. It was demonstrated that the biometric evaluations (adrenal weight) are not good parameters to determine the requirement, because of the high coefficient of variation values obtained in the study. Based on the birds performance, the minimum recommended sodium requirements, estimated by the polynomial model, were of 0.256 and 0.255%, for males and females, respectively.
    Type of Medium: Online Resource
    ISSN: 1516-3598
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2001
    detail.hit.zdb_id: 2078814-9
    Location Call Number Limitation Availability
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  • 4
    In: Revista Brasileira de Zootecnia, FapUNIFESP (SciELO), Vol. 30, No. 3 ( 2001-06), p. 774-784
    Abstract: The true digestibility coefficients of amino acids (TDCaa) were determined and digestible amino acids prediction equations obtained, using the chemical composition of 11 feedstuffs. The feedstuffs evaluated were: brown flour meal, wheat flour, wheat grain, wheat grain residue, wheat germ, cookies residue, macaroni residue and, four wheat brans. The method of "precision feeding" with cecectomized adult rooster was utilized. A randomized complete design was used, with 11 feedstuffs and 1 fast, using six replications with 1 rooster per experimental unit. The average of TDC of amino acids, for the wheat bran 1, wheat bran 2, wheat bran 3, wheat bran 4, brown flour meal, wheat flour, cookies residue, macaroni residue, wheat grain, wheat grain residue, wheat germ meal were 80,1; 76,7; 71,8; 74,5; 84,1; 94,1; 77,9; 90,1; 86,0; 90,3 e 93,1%, respectively. The best prediction equations obtained for the TDCaa values were those using crude protein (CP) and/or ether extract (EE) for lysine and CP and/or neutral detergent fiber (NDF) for methionine, methionine + cystine, threonine and the average of the essential amino acids. The equations were: Lys = -0,8805 + 0,0755*CP + 0,0268*EE (R² = 98%), Met = -0,0377 + 0,0183*CP - 0,0020*NDF (R² = 99%), M+C = 0,0982 + 0,0273*CP - 0,0021*NDF (R² = 92%), Threo = -0,2107 + 0,0401CP - 0,0020*NDF (R² = 96%), Essen = -0,1530 + 0,0451*CP - 0,0024*NDF (R² = 98%).
    Type of Medium: Online Resource
    ISSN: 1516-3598
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2001
    detail.hit.zdb_id: 2078814-9
    Location Call Number Limitation Availability
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