The metabolic rate of fasting sheep in relation to total and lean body weight, and the estimation of maintenance requirements

1967 ◽  
Vol 18 (1) ◽  
pp. 127 ◽  
Author(s):  
N McCGraham
Keyword(s):  
Body Weight ◽  
Metabolic Rate ◽  
Nitrogen Loss ◽  
Tritiated Water ◽  
Lean Body Weight ◽  
Adult Sheep ◽  
Specific Effects ◽  
Body Weights ◽  
Maintenance Requirements ◽  
Urinary Nitrogen

Calculation of maintenance energy requirements from fasting energy loss is discussed. The fasting energy expenditure and urinary nitrogen loss of six Merino wethers (5–7 years old) were determined at body weights of 60, 50, 40, and 30 kg by means of closed-circuit indirect calorimetry. Body composition was estimated from tritiated water space. Similar measurements were made on 51 other adult sheep of various types and on 12 young animals. Simple correlations between metabolic rate and total or lean body weight of adult sheep are described. There was no evidence of specific effects on these correlations due to age of adults, sex, breed, or body condition. The metabolic rate per unit of lean body weight was the same (c. 27 kcall24 hr/lean kg) for sheep as for man; it was up to twice as great for young animals as for adults. On the average, 24% of the fasting heat production of the sheep was derived from protein oxidation; the proportion tended to increase as the sheep lost condition. Differences between sheep in rate of weight loss during undernutrition could not be accounted for in terms of the measured metabolic rates.

THE METABOLIC FECAL NITROGEN EXCRETION OF THE PIG AS INFLUENCED BY THE TYPE OF FIBRE IN THE RATION AND BY BODY WEIGHT

1957 ◽  
Vol 37 (1) ◽  
pp. 106-113 ◽  
Author(s):  
F. Whiting ◽  
L. M. Bezeau
Keyword(s):  
Body Weight ◽  
Nitrogen Balance ◽  
Dry Matter ◽  
Growing Pigs ◽  
The Body ◽  
Nitrogen Excretion ◽  
Wood Cellulose ◽  
Oat Hulls ◽  
Body Weights ◽  
Urinary Nitrogen

Nitrogen balance studies were carried out on growing pigs (15 to 60 kg. body weight) using protein-low rations (approximately 0.3 per cent) to study the influence of body weight and type of fibre in the ration upon metabolic fecal and endogenous urinary nitrogen (N). The types and amounts of fibre used were: pure wood cellulose (Solka-Floc), 7 and 14 per cent of the ration; methocel, 7 and 14 per cent of the ration; and oat hulls, 14 and 28 per cent of the ration.Type and amount of fibre significantly affected the metabolic fecal N excretion of the pig, whether expressed on the basis of dry matter (D.M.) intake or fecal D.M. output. Wood cellulose (Solka-Floc) caused the greatest, and methocel the least, fecal N excretion per unit of D.M. intake. Oat hulls were intermediate.Fecal N excretion varied inversely with the 0.3 power of body weight between the body weights of approximately 15 and 60 kg.Endogenous urinary N in one experiment varied with approximately the 1.0 power of body weight, and in a second experiment with the 0.2 power of body weight. It was not possible in these experiments to determine the factors that influenced endogenous urinary N excretion.

Selection for weaning weight in Merino sheep. 3. Maintenance requirements and the efficiency of conversion of feed to wool in mature ewes

1967 ◽  
Vol 7 (25) ◽  
pp. 117 ◽  
Author(s):  
WA Pattie ◽  
AJ Williams
Keyword(s):  
Body Weight ◽  
Feed Intake ◽  
Weaning Weight ◽  
Gross Efficiency ◽  
Wool Growth ◽  
Body Weights ◽  
Unit Body Weight ◽  
Selection For ◽  
Feed Costs ◽  
Maintenance Requirements

Net and gross efficiencies of wool growth have been estimated for ewes from three Trangie selection flocks, one selected for high weaning weight (Weight Plus), one for low weaning weight (Weight Minus), and a random control flock. Weight Plus ewes had 15 and 11 per cent heavier body weights than Weight Minus ewes at maintenance and unlimited levels of feeding respectively. At each level, feed intake was proportional to body weight both between and within flocks. In addition, the feed costs of a unit gain and loss of body weight were the same for each flock at each level of feeding. The Weight Plus ewes grew 7 and 10 per cent more wool than Weight Minus ewes at maintenance and unlimited levels of feeding. Consequently, there was only a small difference between the flocks in efficiency of conversion of feed to wool at maintenance, and there was no difference on unlimited intake. These results indicate that there is no genetic correlation between weaning weight and efficiency of conversion of feed to wool. At the three levels of controlled feeding (543, 725, 902 grams of dry matter a day) there were no differences in gross efficiency of wool growth, either between flocks or between levels within flocks, despite differing changes in body weight. During unlimited feeding, gross efficiency of wool growth was lower than that during controlled feeding. This was due to a reduced response in wool growth, as feed costs per unit body weight change were constant. As both production and feed intake changed in proportion to body weight, it is concluded that attention to weaning weight has little place in a Merino breeding program aimed at increasing wool production. However, selection for high weaning weight may be a useful tool in selecting ewes for crossbreeding because of the associated increases in milk production and lamb growth rate.

Seasonal variation in intake and digestion of a high-roughage diet by muskoxen

1994 ◽  
Vol 74 (2) ◽  
pp. 305-313 ◽  
Author(s):  
J. Z. Adamczewski ◽  
P. F. Flood ◽  
R. K. Chaplin ◽  
J. A. Schaefer
Keyword(s):  
Body Weight ◽  
Seasonal Variation ◽  
Retention Time ◽  
Dry Matter ◽  
Dry Matter Intake ◽  
Fecal Excretion ◽  
Late Winter ◽  
Apparent Digestibility ◽  
Body Weights ◽  
Maintenance Requirements

We studied changes in body weight, intake, retention time and apparent digestibility of a supplemented brome-alfalfa hay by mature muskoxen held near Saskatoon, Saskatchewan during two seasonal cycles. Body weights and voluntary intake were monitored during 16 trials from late March 1990 to December 1991, in four annually breeding females and in three hysterectomized females. Retention time of the hay and apparent digestibility of the diet were estimated in winter and summer 1991 from fecal excretion of chromium (Cr) after a pulse dose of Cr-mordanted hay, and from forage/fecal concentrations of chromic oxide, respectively, in six non-breeding muskoxen. Mean (±SE) body weights of breeding females were greatest in February and March (248 ± 5 kg) and lowest following calving in late May or early June (216 ± 6 kg), while mean weight of hysterectomized females declined little from a peak of 228 ± 21 kg in February-March to a low of 213 ± 21 kg in July. Mean dry matter intake of breeding females was highest in July and August (62 ± 3.6 g d−1 kg−0.75) then declined slowly to its lowest point in March and April (41 ± 0.7 g d−1 kg−0.75). Dry matter intake of hysterectomized cows was less clearly seasonal but averaged 42 ± 1.7 g d−1 kg−0.75 in late winter and 50 ± 4.9 g d−1 kg−0.75 in mid-summer. Mean retention time of hay, calculated using a noncompartmental model, declined significantly from 114 ± 4 h in March to 95 ± 4 h in July. Apparent organic matter digestibility decreased significantly from 73.8 ± 0.8% in winter to 61.7 ± 1.3% in summer. Compared with other ruminants, muskoxen are grazers exceptionally well-suited to digesting graminoid forage, with relatively low maintenance requirements and prolonged retention times. Most of the seasonal changes in weight and intake of breeding females could be ascribed to reproductive cost, but there also appeared to be seasonal effects on intake, retention time and body weight in non-breeding muskoxen. Key words: Digestibility, intake, maintenance requirements, muskoxen, retention time, seasonal variation

The body composition of growing sheep during milk feeding, and the effect on composition of weaning at various body weights

1976 ◽  
Vol 86 (3) ◽  
pp. 483-493 ◽  
Author(s):  
T. W. Searle ◽  
D. A. Griffiths
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Tritiated Water ◽  
Body Weight Loss ◽  
The Body ◽  
Whole Body ◽  
Protein Energy ◽  
Body Weights ◽  
Similar Body ◽  
Milk Feeding

SummaryThirty-four (13♂, 21♀) entire cross-bred lambs were suckled on reconstituted, spray-dried cows' milk from 2 days of age for varying periods of time up to 18 weeks before being weaned on to solid food or slaughtered to determine chemical composition. The body composition of each sheep (water, fat, protein, energy) was also estimated from the tritiated water (TOH) space at 3-weekly intervals during milk feeding, at intervals of 5–8 weeks subsequently and at slaughter. Comparison between. TOH estimates and whole body analysis confirmed the accuracy of the previously-derived prediction equations.The relationship between each of the various body components and body weight for individual sheep during milk feeding was described by a ‘bent’ (non-rectangular) hyperbola. There were no substantial differences between animals in either the position or slope of the lower asymptote nor in the slope of the upper asymptote. There were, however, substantial differences in the point of intersection of the two asymptotes both within and between sexes. The mean intersection points for males and females were 17·7 and 14·4 kg body weight respectively.Sheep weaned at body weights of 11–16 kg subsequently followed the previously defined pattern of growth. Weaning at higher body weights (21–34 kg, body fat not less than 5·5 kg) resulted initially in both fat and/or body weight loss. In the final fattening phase of growth early- and late-weaned sheep of the same sex had similar body composition but females were fatter than males.

Prediction of body compostion of sheep from tritiated water space and body weight—tests of published equations

1970 ◽  
Vol 75 (3) ◽  
pp. 497-500 ◽  
Author(s):  
T. W. Searle
Keyword(s):  
Body Composition ◽  
Body Weight ◽  
Tritiated Water ◽  
Infected Sheep ◽  
The Body ◽  
Regression Equations ◽  
General Application ◽  
Body Weights ◽  
Healthy Sheep ◽  
Water Space

SUMMARYThe body composition of parasite-infected sheep and of healthy sheep of various body weights and breeding was predicted from tritiated water (TOH) space and body weight using previously published regression equations. Results agreed well with body composition determined by analysis of the minced carcass though a small bias existed in some groups. It is concluded that the equations have a general application to the prediction of body composition in sheep.

Development of the spleen as a red blood cell reservoir in lambs

1996 ◽  
Vol 8 (3) ◽  
pp. 311 ◽  
Author(s):  
SJ Potocnik ◽  
EM Wintour
Keyword(s):  
Body Weight ◽  
Blood Cell ◽  
Blood Cells ◽  
Neonatal Period ◽  
Post Partum ◽  
Spleen Weight ◽  
Adult Sheep ◽  
Body Weights ◽  
Adrenaline Infusion ◽  
Ovine Fetus

In adult sheep and other animals the spleen is a reservoir of red blood cells (RBCs), which can be mobilized by adrenaline-induced splenic contraction. Adrenaline does not increase the haematocrit in the ovine fetus. This study examined the development of a releasable store of RBCs in the spleen of lambs during the neonatal period. Spleen and body weights were measured in 126 fetuses and lambs, ranging in age from 60 days' gestation to 94 days post partum. Spleen weight, as a percentage of body weight, stabilized at 0.56 +/- 0.02%, 20 days post partum. Adrenaline infusion (5 mg kg-1 min-1) was associated with a mean increase in arterial haematocrit (Hct) of 7.6 and 5.8 Hct % in lambs at 20-24 and 50-52 days of age respectively (n = 4 at each age). The spleen in lambs has become a significant reservoir of RBCs by 20-24 days of age and may contain reserves equivalent to those in adult sheep. This splenic reserve is developed before the post-natal drop in haematocrit occurs.

Basal metabolic rate in lambs and young sheep

1974 ◽  
Vol 25 (6) ◽  
pp. 957 ◽  
Author(s):  
NMcC Graham ◽  
TW Searle ◽  
DA Griffiths
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Metabolic Rate ◽  
Basal Metabolic Rate ◽  
Body Weight Gain ◽  
Adult Cattle ◽  
Adult Sheep ◽  
Free Weight ◽  
Wide Range ◽  
Average Adult

Basal metabolic rate (BMR) was determined in 56 crossbred sheep, up to 10 observations being made on each animal between 1 week of age and 2¼ years. The level of feeding was varied amongst the sheep so that there was a wide range in growth rate at each age. BMR was estimated as heat production under standard conditions of fasting. Trends during fasting were studied in four sheep at ages 3 weeks, 2 months and 9 months. The effects on BMR of body weight (or fat-free weight), age, prior growth rate and prior nutrition were examined statistically by estimating the parameters of a series of model equations by a least squares iterative method. Analysis of lamb and sheep data separately and combined showed that all these variates contributed significantly to BMR. Of the variance of BMR, 89% was accounted for in a body weight term, kgx, in which the value of x was not significantly different from ¾ if one or more of the other variates were in the model; x was unity when fat-free weight was used instead of body weight. If body weight was used alone, x was smaller for both lambs and weaners, being c. 0.60; with fat-free weight the values for lambs and weaners were 0.71 and 0.96 respectively. Age, growth rate and level of feeding were of approximately equal importance, together accounting for a further 6% of the total variance. BMR declined by c. 8% per annum and was affected to the extent of 2.8 kJ per gram body weight gain and 46 kJ per MJ digestible energy intake before fasting (all values per 24 hr). Thus an increase in growth rate in a lamb from zero to maximal (0.3 kg/day) caused BMR to increase by 50%, and an increase of food intake by 1 kg/day in an average adult sheep caused BMR to increase by 10%. For any given set of these variates, BMR was 23% higher in milk-fed lambs than in weaned sheep. An equation was derived for sheep in general; the residual standard deviation was c. 300 kJ/24 hr, or 7-8% of BMR in an average adult sheep. Some evidence was cited to show that this equation may be used to predict BMR in growing and adult cattle by multiplying the whole expression by 1.3.

The influence of body weight (fatness) on the energic efficiency of adult sheep

1969 ◽  
Vol 20 (2) ◽  
pp. 375 ◽  
Author(s):  
Graham N McC
Keyword(s):  
Body Weight ◽  
Energy Balance ◽  
Metabolic Rate ◽  
Energy Intake ◽  
Body Condition ◽  
Metabolizable Energy ◽  
Adult Sheep ◽  
Gross Efficiency ◽  
Ad Libitum ◽  
The Relationship

Energy, carbon, and nitrogen balances were determined in adult wether sheep given a diet of lucerne hay and whole oats at several planes of nutrition between fasting and ad libitum. Four sheep were studied when their weight was c. 30 kg (10% fat) and later when they weighed c. 75 kg (33% fat); another four were studied at c. 70 kg (30% fat) and later at c. 45 kg (16% fat). The most obvious effect of fatness was loss of appetite. Voluntary food intake began to decline when body weight approached 60 kg and was half of the maximal amount when the sheep weighed 70 kg or more; one very fat sheep ate only 100–200 g food/day for several weeks. 1n addition, environmental changes such as transfer from a pen to a cage or respiration chamber often caused temporary inappetence when the sheep were in fat condition but seldom when they were lean. Fasting metabolic rate increased with body weight in accordance with the relationship generally applicable to adult sheep except when the sheep were in the anorectic phase of obesity, at which time their metabolic rate was 30–40% above normal. The digestibility of the diet was not dependent on the fatness of the sheep, nor was the relationship between metabolizable and digestible energy. At each level of feeding, the heaviest sheep produced most heat, but differences were less than at fasting; oxidation of fat, rather than protein, was responsible. When daily heat production and metabolizable energy were both expressed as multiples of the fasting energy loss, all sheep conformed to one relationship; the same held for the relation between energy balance and metabolizable energy. Net efficiency (change of energy balance divided by change of metabolizable energy intake) was 78% for maintenance and 55% for production, irrespective of body condition. Gross efficiency (energy storage divided by gross energy intake) was strongly influenced by body condition. When fed ad libitum, thin sheep achieved an efficiency of c. 26 % and fat sheep reached 21 % whereas anorectic very fat sheep never exceeded 10%. Thin, fat, and very fat sheep required 400, 500 and 650 g dry matter/day respectively for maintenance (zero gross efficiency).

Voluntary intake and plane of nutrition of sheep fed hydroponic fodder varieties

2018 ◽  
Author(s):  
Sheik Taha Ansari ◽  
A.Ravi . ◽  
J.V. Ramana and G . Ganga Raju
Keyword(s):  
Body Weight ◽  
Average Yield ◽  
Phosphorus Balance ◽  
Horse Gram ◽  
Adult Sheep ◽  
Sudan Grass ◽  
Fodder Production ◽  
Calcium And Phosphorus ◽  
Voluntary Intake ◽  
Maintenance Requirements

Voluntary intake and plane of nutrition of adult sheep fed six varieties of hydroponic fodder i.e. Sorghum Sudan Grass, cowpea, horse gram, maize, jowar and barley as a sole feed was evaluated using four Nellore Jodipi rams. The average yield of fodder after 7 days of sprouting from 1 kg of seed was higher (P less than 0.01) from maize and barley than from jowar seeds and it was 7.17, 8.07, 7.10, 9.13, 5.38 and 8.22 respectively from Sorghum Sudan Grass, cowpea, horse gram, maize, jowar and barley. The DM was 10.2 to 12.5 % among the fodder varieties with the CP and CF content ranging from 13.7 to 41.0% and 16 to 24%, respectively. The NFE was lower in cowpea and horse gram fodder and it was higher, 61.94% in maize fodder. Sorghum Sudan Grass fodder contained lower lignin of 3.03% while it was higher in cowpea, 10.94%. The DMI (% body weight) was 0.34, 1.11, 0.70,1.31,0.41 and 1.06 from barley, maize, cowpea, horse gram, jowar and Sorghum Sudan Grass, respectively and was lower than the recommended 2.6 to 2.8 % of body weight for maintenance of adult sheep. The DCP was 9.98, 34.49, 23.9, 9.34, 17.91 and 12.73 while the TDN was 45.83, 75.79, 68.08, 77.57, 64.07 and 77.63 % in Sorghum Sudan Grass, cowpea, horse gram, maize, jowar and barley fodder, respectively. The nitrogen, calcium and phosphorus balance of sheep was negative in all varieties. It was concluded that economic fodder production was possible with maize and hydroponic fodder as a sole feed did not meet maintenance requirements. 

Sign in / Sign up

Export Citation Format

Share Document