Indirect calorimetry to estimate energy requirements for growing and finishing Nellore bulls

Posada-Ochoa, Sandra L.; Noguera, Ricardo; Rodríguez, N. M.; Costa, Angela; Reis, Ricardo

doi:10.1016/s2095-3119(16)61443-0

Cited by 8 publications

(6 citation statements)

References 18 publications

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“…Igualmente, animales que alcanzan una mayor cantidad de tejido adiposo antes de la madurez, como en el caso de la raza cebuína, obtiene ganancia de pesos mejores que los animales que no tienen estos depósitos (27).…”

Section: Resultados Y Discusiónunclassified

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

Guillot

Hinsinger

Dufour

et al. 2019

Soil Biology and Biochemistry

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Section: Resultados Y Discusiónunclassified

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

Guillot

Hinsinger

Dufour

et al. 2019

Soil Biology and Biochemistry

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“…The value assumed to represent the conversion of EBW to SBW was one obtained in treatment without feed restriction. The values for conversion ratio of EBW to SBW were different between animals fed restricted and ad libitum (P=0.0002; 0.96 and 0.93, respectively), possibly due to effect of restricted feeding in internal organs as reported by Posada-Ochoa et al (2017). However, the value of 0.93 is in the range suggested by NRC (2000) and BR-Corte…”

Section: Eqmentioning

confidence: 69%

“…Feeding the same diet in three different levels of intake was necessary to obtain regression equations to estimate the energy and protein requirements for no gain situation, equivalent to the maintenance requirements (CÁRDENAS-MEDINA et al, 2010;POSADA-OCHOA et al, 2017).…”

Section: Nutritional Requirementsmentioning

confidence: 99%

Energy and protein requirements for Nellore steers estimated with the deuterium oxide marker

Aferri¹,

Corte²,

Pereira³

et al. 2020

Bol. Ind. Anim.

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The aim of this study was determine the energy and protein requirements for maintenance and gain of Nellore steers. Thirty six Nellore steers with a average weight and age of 359±13 kg and 20 months at the beginning of the trial were individually fed for 56. The steers were fed the same diet (76.43% TDN and 13.62% CP) in three levels of dry matter (DM) intake, ad libitum, 75 g DM/kg BW0.75 and 60 g DM/kg BW0.75. The initial and final body composition was estimated with the marker deuterium oxide that allowed repeated water estimate in the same animal. Deuterium in blood samples was analyzed by mass spectrometry. The effects of intake levels, comparison of intercept and slope among feeding level, and equations were evaluated by the analysis of variance, adopting P<0.05 as a significant level. The net energy for maintenance was 75 kcal/kg EBW0.75 or 70 kcal/kg BW0.75. The net energy for gain for steers with 350 to 450 kg weight was 5.1 to 6.1Mcal. The efficiency of energy utilization for maintenance, km, was 0.7492 and for weight gain, kg, was 0.3404. The metabolizable protein requirement for maintenance was 4.32 * BW0.75 and the net protein for gain was estimated with the equation NPg = (254.68*EBWG) €“ (29.38*RE). The technique of deuterium oxide marker used to estimate energy and protein requirement for maintenance and weight gain at Nellore steers confirm the hypothesis presented in NRC, that NEm is lower than the requirement for taurine cattle. On the other hand, the reverse was true for the NP requirement for maintenance and for weight gain. We consider that indirect method using D2O for estimate body composition in zebu cattle was suitable to determine nutrient requirements.

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“…The metabolizable energy for maintenance is composed of two main components. The first is the basal metabolism, which corresponds to the minimum energy required to support the vital processes in a fasting healthy animal, in the post-absorptive state (48-144 h of fasting after feeding), performing the activity in the thermoneutral environment [17]. The second component associated with the requirement of metabolizable energy for maintenance involves several factors associated with the production of heat originated by the maintenance level, that is, by the heat increment, such as body temperature regulation, voluntary activity, digestion, nutrient absorption and assimilation, fermentation [19,21].…”

Section: Basal Metabolism and Maintenancementioning

confidence: 99%

“…The difference between basal metabolism and maintenance is that when in maintenance, the animal is not fasting [17]. The metabolizable energy requirement for maintenance (EMm) is defined as metabolizable energy intake (MEI), which corresponds exactly to the heat production, without any loss or gain of body reserves [19,21].…”

Section: Basal Metabolism and Maintenancementioning

confidence: 99%

Respirometry and Ruminant Nutrition

Silva¹,

Borges²,

Carvalho³

et al. 2018

Animal Husbandry and Nutrition

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The gaseous exchange between an organism and the environment is measured by respirometry or indirect calorimetry. Once the oxygen consumption (O 2) and the production of carbon dioxide (CO 2) and methane (CH 4) are known, the energy losses by gas and heat can be calculated. Energy metabolism and methane production have been studied in the Calorimetry and Metabolism Laboratory of the Federal University of Minas Gerais, located in Belo Horizonte, Minas Gerais, Brazil. Animals used are mainly Zebu cattle and their crossbreeds that represent most beef and dairy cattle breed grazed on tropical pastures. System calibration and routine work are addressed in this text. The results obtained on respirometric chambers are expressed in net energy (NE), which can be net energy for maintenance (NE m), lactation (NE L), weight gain (NE g), and pregnancy (NE p). NE is, in fact, what is used by the animal for maintenance and each productive function. The values of k (conversion efficiency of ME into NE) for maintenance (k m), milk (k L), weight gain or growth (k g), and pregnancy (k p) are determined. Thanks to the peculiarity of the respirometric technique, the same animal can be evaluated several times, in different physiological states and planes of nutrition.

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Indirect calorimetry to estimate energy requirements for growing and finishing Nellore bulls

Cited by 8 publications

References 18 publications

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

With or without trees: Resistance and resilience of soil microbial communities to drought and heat stress in a Mediterranean agroforestry system

Energy and protein requirements for Nellore steers estimated with the deuterium oxide marker

Respirometry and Ruminant Nutrition

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