Exigência de energia de mantença e composição corporal e do ganho de vacas de corte adultas de três grupos genéticos confinadas

Siqueira, João Gomes de; Fontes, Carlos Augusto de Alencar; Pereira, Alexandre Leite; Lombardi, Cláudio Teixeiras; ́Ana, Nivaldo de Faria Sant; Vieira, Ricardo Augusto Mendonça

doi:10.1590/s1516-35982007000900028

Cited by 6 publications

(5 citation statements)

References 27 publications

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“…Silva et al (2002) , respectively). These differences were expected because energy requirements may vary among genetic groups (SIQUEIRA et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Energy and protein requirements of crossbred cattle in feedlot

et al. 2016

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The objective of this study is to predict the energy and protein requirements of crossbred dairy cattle in feedlot. The study was conducted at the Unidade Acadêmica de Serra Talhada, Universidade Federal Rural de Pernambuco, Brazil with 30 bulls with a body weight of 339.1 ± 35.4 kg. Five animals were slaughtered at the end of the adaptation period to serve as the reference group; the remainder of the animals was slaughtered after 112 days. The latter group was randomly allocated to receive five treatments: 0, 17, 34, 51 and 68% of concentrate in the feed using a completely randomized design. The dietary intake of the animals that were not given concentrate was restricted to 1.5% of their body weight; these animals composed the group fed for maintenance. The body composition and empty body weight (EBW) were estimated by means of the comparative slaughter method and full dissection of a half-carcass. The results showed that for crossbred dairy bulls in confinement, the net and metabolizable energy requirements were 86.49 and 138 kcal EBW -0.75 day -1 , respectively, and the efficiency of use of metabolizable energy for maintenance and gain were 62.67% and 31.67%, respectively. The net energy (NE g ) and net protein (NP g ) requirements for gain can be estimated using the following equations, respectively: NE g = 0.0392*EBW e PLg = 242,34 × GPCVZ -23,09 × ER, respectivamente. A eficiência do uso da proteína metabolizável para ganho foi de 25,8% enquanto que as exigências de proteína para mantença foram 2,96 g PCVZ -0,75 dia -1 . A proteína degradável no rúmen pode suprir 62,44% das exigências em proteína bruta de bovinos mestiços leiteiros, machos não castrados, em confinamento, com peso corporal de 450 kg e ganho de 1 kg dia -1 . Palavras-chave: Composição corporal. Ganho de peso. Mantença.

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“…Silva et al (2002) , respectively). These differences were expected because energy requirements may vary among genetic groups (SIQUEIRA et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

Energy and protein requirements of crossbred cattle in feedlot

et al. 2016

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“…According to Siqueira et al (2007), the energy requirement of cattle varies between genetic groups. However, this statement reported by the aforementioned authors does not corroborate the results of this research.…”

Section: Resultsmentioning

confidence: 99%

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

et al. 2012

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-The objective of this study was to determine the energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two levels of concentrate. Sixty heifers from three genetic groups were used: 20 Nellore, 20 Nellore × Angus and 20 Nellore × Simmental. Twelve belonged to the reference group (four of each genetic group) and were slaughtered at the beginning of the experiment. Another 12 heifers (four of each genetic group) were fed on the maintenance level and 36 heifers (12 animals of each genetic group) were kept in feeding system ad libitum with 30 (six in each group) or 50% (six of each group) dry matter concentrate. Animals were randomly assigned to six treatments in a 3 × 2 factorial arrangement (three genetic groups and two diets) with six replicates per treatment. Nine more heifers were used in a parallel experiment to estimate the apparent digestibility coefficients (three from each genetic group). Net energy requirements were estimated by the equation of retained energy as a function of metabolic empty body weight (EBW 0.75 ) and empty body weight gain (EBWg). Requirements of metabolizable and net energy were estimated for maintenance by the equation of heat production as a function of metabolizable energy intake. Using the combined equation RE (retained energy; Mcal/day) = 0.0703 × EBW .75 × EBWg 1.128 to predict net energy requirements for weight gain is recommended. The requirement of metabolizable and net energy for maintenance of all groups is 70.55 and 106.53 kcal/kgEBW 0.75 /day, respectively. Use efficiencies of metabolizable energy for gain and maintenance are 36.41 and 66.23%, for the three genetic groups respectively.

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“…This value is within the confidence interval of 95% (72 to 82) for the estimate 77 kcal/ kg 0.75 EBW observed for Bos taurus by Lofgreen & Garrett (1968) and adopted by the NRC (2000). Bos taurus, Bos indicus and crossbred cattle also did not differ in NE m requirement in works conducted by Ferrell & Jenkins (1998), Freitas et al (2006 and Siqueira et al (2007). Differences in energy requirements for maintenance, within and between breeds, have been partly attributed to the size of the internal organs (Garrett, 1980;Dicostanzo et al 1990;Ferrell & Jenkins, 1998).…”

Section: Resultsmentioning

confidence: 85%

“…Forage intake was estimated in two trials during the experimental period by using the double indicator method (Smith & Reid, 1955). LIPE ® (hidroxiphenilpropan modified and enriched) and lignin in H 2 SO 4 were used as external and internal indicator, respectively.…”

Section: Methodsmentioning

confidence: 99%

Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing

et al. 2011

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-The objective of this work was to estimate net energy (NE m ) and metabolizable energy (ME m ) requirements for maintenance and efficiency of use of metabolizable energy for maintanence (k m ) and gain (k g ) of grazingNellore and crossbred steers. It was used 24 castrated steers, 12 Nellore breed (386 kg SBW) and 12 ½ Limousin-Nelore crossbred (397 kg SBW). The comparative slaughter method was used. In each genetic group, animals were grouped in three similar groups: reference; restrict feeding and ad libitum feeding. The reference group was slaughtered in the beginning of the experiment whereas the others were slaughtered at the end of it. During the 104 days of the experimental period, the group under restrict feeding had access to pastures for 3.5 hours daily whereas the group with ad libitum feeding remained on pasture full time. Forage intake was estimated in two trials by using the double-indicator method. Values of NE m , ME m , k m and k g were estimated on the basis of empty body weight ( Revista Brasileira de Zootecnia

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Exigência de energia de mantença e composição corporal e do ganho de vacas de corte adultas de três grupos genéticos confinadas

Cited by 6 publications

References 27 publications

Energy and protein requirements of crossbred cattle in feedlot

Energy and protein requirements of crossbred cattle in feedlot

Energy nutritional requirements for females of Nellore, Nellore × Angus and Nellore × Simmental fed on two forage: concentrate ratios

Energy partition for maintenance and weight gain in Nellore and crossbred steers finished under grazing

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