Efficiency of Utilization of Metabolizable Energy during Pregnancy and the Energy Requirements for Pregnancy in Sheep

Rattray, P. V.; Garrett, W. N.; East, Nancy; Hinman, Nancy W.

doi:10.2527/jas1974.382383x

Cited by 52 publications

(33 citation statements)

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“…Hence, for calculating nutrient requirements for separate functions, a has to be distributed judiciously among the two predictor variables used in the model so that prediction error remains at a minimum while forcing the equation through a zero intercept. This was done by forcing the regression equation through the origin using a model of the type used or recommended by others12, 20–25 for partitioning of nutrient intake for estimation of requirement. The model has the form where Y is intake of ME, CP or MP (kJ or g d −1 ); X 1 is MBW (kg); X 2 is ADG (g); the regression coefficient b 1 is the estimate of requirements for maintenance (kJ or g kg −1 MBW); the regression coefficient b 2 is the estimate of requirements for body weight gain (kJ or g g −1 gain).…”

Section: Methodsmentioning

confidence: 99%

Energy and protein requirements of growing Nili‐Ravi buffalo heifers in tropical environment

Paul¹,

Patil²

2007

J Sci Food Agric

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Thirty Nili-Ravi buffalo heifers (average initial weight 119 kg) were used to assess energy and protein requirements for maintenance and growth. The calves were randomly divided into six equal groups and were fed six diets consisting of three levels of energy (55%, 60% and 65% total digestible nutrient -TDN) in ration and two levels of protein (10% and 12% crude protein -CP) in ration in factorial arrangement ad libitum until they attained 400 kg body weight. Energy and protein requirements at different stages of growth were estimated by partitioning of the metabolizable energy (ME), CP and metabolizable protein (MP) intake for maintenance and body weight gain by regression analysis. All of the multiple regression equations derived for different body weight ranges were highly significant (P < 0.01) and had high R 2 values. The ME (

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Section: Methodsmentioning

confidence: 99%

Energy and protein requirements of growing Nili‐Ravi buffalo heifers in tropical environment

Paul¹,

Patil²

2007

J Sci Food Agric

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“…The BW range classes were as per the existing feeding standards being followed in India for pigs recommended by ICAR (Indian Council of Agricultural Research). The experimental data were subjected to regression analysis using the following model: A similar model was also used by other workers (Ratray et al, 1974;Abate, 1989;Walter and Mao, 1989;Solis et al, 1991;Paul et al, 2002Paul et al, , 2003aPaul et al, , b and 2004 for estimation of nutrient requirements from feeding trial data.…”

Section: Data Collectionmentioning

confidence: 99%

Determination of nutrient requirements for growth and maintenance of growing pigs under tropical condition

Paul

Mandal

Chatterjee

et al. 2007

Animal

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Data from 27 feeding trials conducted on growing pigs from different research institutes across India were subjected to mixed model regression analysis to derive requirements of digestible energy (DE), crude protein (CP) and essential amino acids for maintenance and body weight gains. The ranges of maintenance requirements were determined to be: DE 516 to 702 kJ/kg M 0.75 , CP 6.98 to 11.62, lysine 0.431 to 0.664, methionine 0.265 to 0.458, methionine þ cystine 0.327 to 0.466, cystine 0.055 to 0.184, threonine 0.205 to 0.511, arginine 0.377 to 1.21, isoleucine 0.241 to 0.775, leucine 0.604 to 1.54, phenylalanine þ tyrosine 0.496 to 1.33, tryptophan 0.078 to 0.213, and valine 0.330 to 0.892 g/kg M 0.75 , respectively for different body weight ranges. The corresponding requirements for 1 g gain in body weight were: DE 28.6 to 38.6 kJ, CP 0.27 to 0.44 g, lysine 0.0071 to 0.0126 g, methionine 0.0047 to 0.0133 g, methionine þ cystine 0.0151 to 0.0261 g, cystine 0.0043 to 0.0094 g, threonine 0.0052 to 0.0165 g, arginine 0.0045 to 0.0301 g, isoleucine 0.0023 to 0.0198 g, leucine 0.0150 to 0.0447 g, phenylalanine þ tyrosine 0.0091 to 0.0382 g, tryptophan 0.0005 to 0.0044 g, and valine 0.0061 to 0.0222 g. Regression equations had high R 2 values (ranging from 0.50 to 0.99 for different estimates), low coefficients of variation, low variance of error estimates and the coefficients were highly significant (P , 0.001). Regressed values were used to develop feeding standards. As the new standards derived in the present study are based on a thorough analysis of a larger database than previous Indian standards, the new feeding standard seems to be more appropriate for India and other tropical countries.

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“…It was assumed that energy gains and losses made by animals in alternating periods of weight gain and loss would be equivalent (Graham, 1967;Searle, Graham and O'Callaghan, 1972). Conversion of empty to fasted body weight (WGT) was achieved by use of the equation published by Rattray, Garrett, East and Hinman (1974).…”

Section: Energy Utilization By the Animalmentioning

confidence: 99%

A quantitative model of energy intake and partition in grazing sheep in various physiological states

1977

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A quantitative model of energy intake and utilization by ewes in various physiological states grazing a pasture of perennial ryegrass is presented. The model consists of two major components: a forage intake component incorporating forage availability and maximum potential intake as affected by age of the grass and physiological state of the ewe; a second component representing energy utilization by the ewe for maintenance, growth, pregnancy, lactation and wool growth. The behaviour of the model was examined and found to be consistent with published information. Partial validation of the model was accomplished by comparing the model output with actual experimental data not used to construct the model.

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Efficiency of Utilization of Metabolizable Energy during Pregnancy and the Energy Requirements for Pregnancy in Sheep

Cited by 52 publications

References 0 publications

Energy and protein requirements of growing Nili‐Ravi buffalo heifers in tropical environment

Energy and protein requirements of growing Nili‐Ravi buffalo heifers in tropical environment

Determination of nutrient requirements for growth and maintenance of growing pigs under tropical condition

A quantitative model of energy intake and partition in grazing sheep in various physiological states

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