000063751 001__ 63751
000063751 005__ 20171221155153.0
000063751 037__ $$aTAZ-TFM-2017-209
000063751 041__ $$aeng
000063751 1001_ $$aTemmar, Rokia
000063751 24200 $$aDetermination of amino acids potentially limiting the growth of milk fed calves
000063751 24500 $$aDeterminación de los amino ácidos potencialmente limitantes en el crecimiento de los terneros lactantes
000063751 260__ $$aZaragoza$$bUniversidad de Zaragoza$$c2017
000063751 506__ $$aby-nc-sa$$bCreative Commons$$c3.0$$uhttp://creativecommons.org/licenses/by-nc-sa/3.0/
000063751 520__ $$aThe objective of this study was to compare the effect of feeding milk-replacer (MR) with or without added specific amino acids on calf growth and plasma amino acids concentration. Eighty calves were selected at random from a commercial farm. The average age at entry was 2.8 ± 1.75 d and the average initial body weight was 43.5 ± 6.36 kg. Calves were distributed to 1 of 4 MR treatments: 1) Control, a MR with 24.5% CP and 21.0% fat; LMT treatment, the MR supplemented with 0.62% L-Lys, 0.22% L-Met and 0.61% Thr; 3) PT treatment, the MR supplemented with 0.2 % Phe and 0.2 % Tyr; and PG treatment, the MR supplemented with 0.3% Pro and 0.1% Gly. All treatments were fed daily for 56 d. Calves received 4 l/day from day 1 to 4, 5 l/day from day 5 to 14, 6 l/day from day 15 to 49 and 3 l/day from day 50 to weaning at 56. Calf starter and straw were offered throughout the study. During this period, feed intake and growth performance were measured. There were no differences among treatments in body weight (BW), wither height (WH), average daily gain (ADG) or feed efficiency. From day, 1 to weaning at day 56 DM intake was in average 61.8 kg, ADG 787.3 g/d and feed efficiency 0.64. At weaning, average BW, WH and BW: WH ratio was 88.9 kg, 98 cm and 0.91, respectively. Therefore, feeding calves with an MR that contains 24.5% CP and 17% fat contains sufficient amino acids to support the target growth.
000063751 521__ $$aMáster Universitario en Nutrición Animal
000063751 540__ $$aDerechos regulados por licencia Creative Commons
000063751 700__ $$aCalsamiglia Blancafort, Sergio$$edir.
000063751 7102_ $$aUniversidad de Zaragoza$$bProducción Animal y Ciencia de los Alimentos$$cProducción Animal
000063751 7202_ $$aManuel Fondevila Camps$$eponente
000063751 8560_ $$f732679@celes.unizar.es
000063751 8564_ $$s1290380$$uhttps://zaguan.unizar.es/record/63751/files/TAZ-TFM-2017-209.pdf$$yMemoria (eng)
000063751 909CO $$ooai:zaguan.unizar.es:63751$$pdriver$$ptrabajos-fin-master
000063751 950__ $$a
000063751 951__ $$adeposita:2017-12-21
000063751 980__ $$aTAZ$$bTFM$$cVET