scholarly journals Energy and protein nutrition of early-weaned pigs. 1. effect of energy intake and energy: protein on growth, efficiency and nitrogen utilization of pigs between 8–32 d

1980 ◽  
Vol 43 (2) ◽  
pp. 289-304 ◽  
Author(s):  
K. J. McCracken ◽  
S. M. Eddie ◽  
W. G. Stevenson
Keyword(s):  
Least Squares Method ◽  
Energy Content ◽  
Skim Milk ◽  
Nitrogen Retention ◽  
Growth Efficiency ◽  
Initial Energy ◽  
Feed Conversion ◽  
Response Curves ◽  
Protein Levels ◽  
Rate Of Increase

1. The effect of energy and protein intake on the growth, food efficiency and nitrogen retention of artificially-reared pigs was studied over three 8 d periods between 8–32 d of age in an experiment employing a 5×3×2 factorial design. The factors were initial energy: N value (I; 250, 355, 460, 565 or 670 kJ/g N), rate of increase of 1 at 8 d intervals (0, 12.5 or 25%) and plane of nutrition (three times daily to appetite or 75% of this intake).2. The range of energy: N values was obtained by formulating five diets based on dried skim milk, lactose and casein and feeding appropriate combinations of two diets. The diets, which were pelleted, contained 100 g maize oil/kg and the gross energy content was approximately 20 MJ/kg.3. N digestibility was high at all three age intervals, reaching 0.99 on the diet containing the highest dietary crude protein (N × 6.25) level. Metabolic faecal N excretion was found to be 1.1 g/kg dry matter (DM) intake.4. Growth rate, feed conversion ratio (kg food intake/kg wt gain; FCR), N retention (NR) and the proportion of digested N retained (NR:apparent digested N (ADN)) were significantly (P < 0.001) affected by I values at all age intervals and the responses were quadratic. Response curves were calculated by the least squares method and optimum values of I determined for each of the criteria.A constant energy:N value of approximately 400 kJ/g N was indicated by growth, FCR and NR optima but the NR:ADN value fell from 0.77 for the 8–16 d period to 0.60 for the 24–32 d period at this I value. It is concluded that a suitable compromise would be an I value of 470 kJ/g N increasing by 10%/week.5. There was a significant interaction between plane of nutrition and I values on FCR between 16–24 d (P < 0.001) and 8–32 d (P < 0.01) indicating that FCR was better at high protein levels and worse at low protein levels when the diets were fed on the lower plane of nutrition.

Protein levels in diets for European pigs in the tropics. 1. The effect of methionine supplementation on the protein requirement of growing pigs

1975 ◽  
Vol 20 (1) ◽  
pp. 133-146 ◽  
Author(s):  
B. L. Fetuga ◽  
G. M. Babatunde ◽  
V. A. Oyenuga
Keyword(s):  
Protein Level ◽  
Nitrogen Retention ◽  
Live Weight ◽  
Growing Pigs ◽  
Feed Conversion ◽  
Large White ◽  
Dietary Nitrogen ◽  
Protein Levels ◽  
Weight Growth ◽  
Cystine Level

SUMMARYOne hundred and twenty-eight Landrace and Large White pigs were allocated on the basis of sex, litter origin and initial weight to one of 16 treatments, made up of four basal 16, 18, 20 and 22% protein diets, each supplemented with either 0·00, 0·10, 0·15 or 0·20% synthetic DL-methionine, at a common digestible energy level of 3740 kcal/kg. Pigs were reared between 8 and 50 kg live weight. Growth rate of pigs and efficiency of feed conversion were significantly improved as the protein levels were increased up to the 20% protein level, optimal performance being on the 20% protein diet, with added 0·15% methionine, giving a total methionine+cystine level of 0·65% and a lysine level of 1·07%. Addition of synthetic methionine to the diets resulted in significant improvement in the rate and efficiency of gain only at the 16 and 18% protein levels.Carcass leanness and fatness increased and decreased respectively over the whole range of protein levels. Graded addition of DL-methionine within each protein level did not influence carcass characteristics.Nitrogen retention showed optimal utilization of dietary nitrogen to be at the 18% protein level, with a total dietary methionine + cystine level of 0·61%, which was at variance with the levels indicated by both growth and feed efficiency.

Growth and carcase quality of lambs fed concentrate rations in a feedlot

1970 ◽  
Vol 10 (43) ◽  
pp. 145
Author(s):  
B Romberg ◽  
GR Pearce ◽  
DE Tribe
Keyword(s):  
Weight Loss ◽  
Crude Protein ◽  
Initial Period ◽  
Nitrogen Retention ◽  
Feed Conversion ◽  
Initial Weight Loss ◽  
Protein Levels ◽  
Dry Matter Digestibility ◽  
Rumen Ph

Two feedlot experiments were conducted during 1967 and 1968 using crossbred lambs and concentrate rations. In experiment 1, in 1967, seven rations at three crude protein levels (approximately 15, 21, and 29 per cent) and with various constituents were fed to lambs selected at 50 lb bodyweight. Three rations were in both the pelleted and the dry mash form. Growth rate, efficiency of feed conversion, and carcase quality were measured. After an initial period of twelve days, when all lambs lost weight, lambs on the pelleted diets grew faster than those on the mash diets, but there were no differences due to protein level or to the various constituents in the diets. In experiment 2, in 1968, three pelleted diets were compared, two at low and high crude protein from experiment 1 (17 and 31 per cent), and the third at 19 per cent. Four treatments were included within each diet to overcome the initial period of weight loss : a. diet alone, b. diet and 30 per cent hay decreasing to none after 12 days, c. diet with 3 per cent calcium carbonate included throughout the experiment, d. diet with 3 per cent CaCO3 included, plus hay for the first 12 days. Hay overcame the initial weight loss and low rumen pH, but subsequently the lambs fed the lowest protein diet with 3 per cent CaCO3 grew faster and were the most efficient. Dry matter digestibility and nitrogen retention were also compared in a metabolism trial for the three diets in experiment 2.

Comparison of protein concentrations in diets given unchanged to pigs from 18 to 93 kg live weight

1970 ◽  
Vol 12 (3) ◽  
pp. 403-412 ◽  
Author(s):  
I. A. M. Lucas ◽  
K. L. Miles
Keyword(s):  
Growth Rate ◽  
Growth Rates ◽  
Protein Level ◽  
Feed Efficiency ◽  
Crude Protein ◽  
Energy Content ◽  
Live Weight ◽  
Progeny Test ◽  
Feed Conversion ◽  
Protein Levels

SUMMARYIn the national pig progeny test stations one diet is given up to about 55 kg live weight and another, with less protein, is given from then until slaughter. These diets were compared with four ‘single’ diets, similar in digestible-energy content, but containing either 15·6, 17·4, 18·7 or 22·1% crude protein, and each given unchanged from 18 to 93 kg live weight. There were twenty groups of one castrate and one gilt on each treatment.Pigs given the lowest protein levels had the poorest growth rates and feed conversion efficiency up to 57 kg live weight, but the best from 57 to 93 kg. Hence there were no differences in overall feed efficiency, and overall growth rate was only slightly less with the lowest protein level than with other treatments.Carcass leanness rose with protein level in the ‘single’ diets over the range 15·6·18·7% crude protein, but a further increase to 22·1% reduced leanness.Pigs given the progeny test diets had carcasses intermediate in composition to those of pigs on the ‘single’ diets with 17·4% and 18·7% protein.

scholarly journals Effect of dietary protein levels on the performance and carcass characteristics of cockerel finishers

2021 ◽  
Vol 31 (1) ◽  
pp. 27-31 ◽  
Author(s):  
R. I. Salami ◽  
O. G. Longe ◽  
J. A. Oluyemi
Keyword(s):  
Crude Protein ◽  
Energy Content ◽  
Carcass Characteristics ◽  
Response Criteria ◽  
Feed Conversion ◽  
Protein Levels ◽  
Dietary Crude Protein ◽  
Metabolisable Energy ◽  
Diet Dilution ◽  
Modified Diet

A study was carried out to investigate the effect of dietary crude protein (CP) levels in diets of 2600kcal kg metabolisable energy content on the performance and carcass characteristics of cockerel finishers. The experimental diets A, B, C, D and E contained CP levels of 140, 160, 180, 200 and 200g kg and they were produced by modified diet dilution technique. Response criteria such as weight gain and feed conversion ratio, among others, and carcass characteristics were measured. Results on performance and carcass characteristics, with the exception of the neck, intestinal weights  and other visceral offals, revealed that these response criteria were optimized in the birds fed on 180g kg dietary CP level. Beyond this level, it was nor beneficial to feed higher CP levels. It is therefore, concluded that the CP requirement of finisher cockerels is 18% on the bases of their Performance and carcass characteristics.

Replacement value of dried egg meal for skim milk powder in diets for young pigs

1975 ◽  
Vol 15 (73) ◽  
pp. 207 ◽  
Author(s):  
MR Taverner ◽  
R Campbell
Keyword(s):  
Fish Meal ◽  
Energy Content ◽  
Milk Powder ◽  
Skim Milk ◽  
Skim Milk Powder ◽  
Feed Conversion ◽  
Powder Component ◽  
Young Pigs ◽  
Soyabean Meal ◽  
The Mean

The growth of piglets reared individually in pens over the age interval three to eight weeks was compared for isocaloric and isonitrogenous diets in which part or all of the skim milk powder component of the diet was replaced by dried egg meal. Other components common to all diets included wheat, soyabean meal and fish meal. The dried egg meal and skim milk powder in total comprised 55 per cent of the protein concentrate in each diet. The mean growth rates and feed conversion ratios of 360 g day-1 and 2.14 kg feed kg-1 in liveweight gain, respectively, did not differ significantly for any diet. In a further experiment with older pigs the digestible energy content of dried egg meal and skim milk powder was shown to be 6127 and 3907 kcal kg-1 of dry feed respectively.

Artificial rearing of pigs

1976 ◽  
Vol 35 (2) ◽  
pp. 253-258 ◽  
Author(s):  
R. Braude ◽  
H. D. Keal ◽  
M. J. Newport
Keyword(s):  
Weight Gain ◽  
Beef Tallow ◽  
Dry Matter ◽  
Energy Content ◽  
Skim Milk ◽  
Nitrogen Retention ◽  
Live Weight ◽  
Soya Bean ◽  
Slight Reduction ◽  
Live Weight Gain

1. Diets containing different proportions of skim milk and fat, either beef tallow or soya-bean oil, supplemented with fat-soluble vitamins were given to 2-d-old pigs. Each fat source was used in three diets containing approximately 280, 350 and 420 g fat, and 260, 235 and 210 g protein/kg dry matter respectively..2. The diets were given as a milk containing 200 g solids/l during a 26 d experiment. The pigs were given the diet at hourly intervals according to a scale based on live weight..3. Increasing the energy content of the diet, with the accompanying decrease in protein content, had no effect on live-weight gain or feed: gain ratio (g feed dry matter/g live-weight gain) (other than a slight reduction in live-weight gain when beef tallow was used), or on nitrogen retention. However, the fat content of the carcass of the 28-d-old pig was increased, and its protein and ash content were decreased..4. The apparent digestibilities of the fatty acid ranged from 0.96 to 1.00. The faeces from pigs given the soya-bean-oil diets contained some eicosanoic, docosanoic and tetracosanoic acids, presumably of bacterial origin. In general, palmitic and stearic acids were slightly less well digested than oleic and linoleic acids.

Continuous 14 day infusion of IGF-II increases the growth of normal female rats, but exhibits a lower potency than IGF-I

1995 ◽  
Vol 144 (1) ◽  
pp. 91-98 ◽  
Author(s):  
M A Conlon ◽  
G L Francis ◽  
F M Tomas ◽  
J C Wallace ◽  
G S Howarth ◽  
...  
Keyword(s):  
Body Weight Gain ◽  
Nitrogen Retention ◽  
Young Female ◽  
Female Rats ◽  
Nitrogen Excretion ◽  
Normal Female ◽  
Feed Conversion ◽  
Protein Levels ◽  
Igf I ◽  
Igf Binding

Abstract The effects of continuous 14 day infusion of recombinant human IGF-I (104 or 260 μg/day) or IGF-II (104, 260 or 650 μg/day) via s.c. implanted osmotic pumps were compared in young female rats in order to establish the relative efficacies of these two growth factors. Significant increases in body weight gain and feed conversion efficiency were achieved by 260 of IGF-I or 650 μg/day of IGF-II. These treatments were associated with increased nitrogen retention and increases in the fractional weights of kidneys, spleen, total gut and individual gut regions. There was an increase in the size of villi and muscularis lining the jejunum, suggesting an increased absorptive capacity of the gut. However there was no significant change in the amount of faecal nitrogen excretion when expressed as a percentage of nitrogen intake. Interestingly, IGF-II was at least as potent as IGF-I in increasing the depth of jejunal crypts. Infusion of equivalent doses of either IGF-I or IGF-II resulted in similar increases in circulating concentrations of the respective peptides, though IGF-II infusion dosedependently decreased plasma IGF-I concentrations from those of the controls. Plasma IGF-binding protein levels were increased by both IGF-I and IGF-II treatments, though IGF-I elicited greater responses. In summary, IGF-II can promote the growth of young female rats, although generally less potently than IGF-I. Journal of Endocrinology (1995) 144, 91–98

scholarly journals Energy and protein nutrition of early-weaned pigs. 2. effect of energy intake and energy: protein on energy utilisation and body composition of pigs slaughtered at 32 d

1980 ◽  
Vol 43 (2) ◽  
pp. 305-319 ◽  
Author(s):  
K. J. McCracken ◽  
S. M. Eddie ◽  
W. G. Stevenson
Keyword(s):  
Crude Protein ◽  
Dry Matter ◽  
Energy Content ◽  
Skim Milk ◽  
Live Weight ◽  
Carcass Composition ◽  
Metabolizable Energy ◽  
Energy Utilization ◽  
Maximum Value ◽  
Rate Of Increase

1. The effect of energy and protein intake on the nitrogen and energy utilization and carcass composition of artificially-reared pigs was studied between 8 and 32 d of age in an experiment employing a 5 × 3 × 2 factorial design. The factors were initially energy:N value (I) (250, 355, 460, 565 or 670 kJ/g N), rate of increase of I (R) at 8 d intervals (0, 12.5 or 25%) and plane of nutrition (three times daily to appetite or 75% of this intake).2. The range of energy:N values was obtained by formulating five diets based on dried skim milk, lactose and casein and feeding appropriate combinations of two diets.3. The metabolizable energy (ME) intake, carcass dry matter (DM) content, carcass protein gain and carcass fat gain exhibited significant (P < 0.001) quadratic responses to I.4. The carcass fat content in the DM increased from 200 to 342 g/kg (P < 0.001) and the carcass crude protein (N × 6.25) content decreased from 657 to 519 g/kg with increasing level of I (P < 0.001). The fat and protein contents were 309 and 556 g/kg and 242 and 610 g/kg respectively on the high and low plane of nutrition (PN) and were significantly different (P < 0.001).5. There was a significant I × R interaction in relation to carcass protein gain with the maximum gain occurring at 460 kJ/g N when I was constant and at 355 kJ/g N when R was 25% per 8 d.6. The proportion of apparent digested N intake retained (N retention (NR): apparent digested N (ADN)) was significantly (P < 0.001) affected by all three factors and there were significant I × R (P < 0.001), I × PN (P < 0.01) and R × R × PN (P < 0.01) interactions. The maximum value of NR:ADN was 0.80.7. Carcass fat gain and carcass energy gain exhibited quadratic responses to I reaching maximum values at 460 kJ/g N. The energy content of the live-weight gain increased linearly (P < 0.001) from 5.79 to 7.90 MJ/kg with increasing level of I. PN and R also produced significant (P < 0.001) responses the means being respectively 7.52 and 6.39 MJ/kg on the high and low PN and 6.55, 6.94 and 7.38 kJ/kg with increasing value of R.8. Multiple regression analysis of ME intake on live-weight (W), protein gain (PG) and fat gain (FG) yielded the equation: <m:math><m:mrow><m:mtext>ME</m:mtext><m:mo stretchy="false">(</m:mo><m:mtext>MJ</m:mtext><m:mo stretchy="false">)</m:mo><m:mo>=</m:mo><m:mn>0</m:mn><m:mo>.</m:mo><m:mn>644</m:mn><m:msup><m:mtext>W</m:mtext><m:mrow><m:mn>0</m:mn><m:mo>.</m:mo><m:mn>75</m:mn></m:mrow></m:msup></m:mrow><m:mo>+</m:mo><m:mn>32</m:mn><m:mo>.</m:mo><m:mn>6</m:mn><m:mtext>PG</m:mtext><m:mo>+</m:mo><m:mn>48</m:mn><m:mo>.</m:mo><m:mn>2</m:mn><m:mtext>FG</m:mtext><m:mo>.</m:mo></m:math>This result is discussed in relation to published values for the energy requirements of the young pig.

PROTEIN LEVELS IN UREA-SUPPLEMENTED STARTER RATIONS FOR YOUNG CALVES

1976 ◽  
Vol 56 (4) ◽  
pp. 817-821 ◽  
Author(s):  
K. A. WINTER
Keyword(s):  
Conversion Efficiency ◽  
Soybean Meal ◽  
Crude Protein ◽  
Nitrogen Retention ◽  
Experimental Period ◽  
Feed Conversion ◽  
Feed Conversion Efficiency ◽  
Protein Levels ◽  
Low Protein ◽  
Weight Gains

Holstein bull calves weaned at 5 wk of age were fed a complete calf starter ration with and without supplementation with soybean meal (SBM) or urea to provide the following levels of crude protein: (1) 12.5% (no supplement); (2) 17.5% (1.5% urea); (3) 21.6% (2.7% urea); and 17.9% (soybean meal). Calves fed the low protein starter had significantly poorer weight gains and feed conversion efficiency than those on the SBM starter; while feed intakes were only slightly reduced over the 8-wk experimental period. Calves fed the starters containing 1.5 and 2.7% urea had similar weight gains, feed intakes and feed conversion efficiency and their performance was intermediate between the low protein and SBM starter groups. Nitrogen retention was lowest with the low protein starter, tended to increase with increasing levels of urea and was highest when the starter contained SBM. Dry matter and energy digestibilities were lowest with the low protein starter, but were similar with the urea- and SBM-supplemented starters. There was no apparent advantage in increasing the crude protein content of urea-supplemented starters beyond 17.5%.

scholarly journals Determination of Optimum Protein and Energy Levels for Broiler Chicks in the Tropics

2021 ◽  
Vol 3 (1) ◽  
pp. 177-183
Author(s):  
J. M. Olomu
Keyword(s):  
Energy Level ◽  
Energy Content ◽  
Energy Levels ◽  
Broiler Chicks ◽  
Feed Conversion ◽  
Tropical Country ◽  
Protein Levels ◽  
The Tropics ◽  
Slight Depression

THREE experiments were conducted to investigate the effects of different protein levels (17, 20, 23 and 26%) and energy levels (2800, 3000 and 3200 KCals/Kg diet) on the performance of broiler chicks in the tropics. Maximum weight gains and efficiency of feed conversion were obtained on the rations containing 23 or 26% protein. As the dietary energy level increased, there was a slight depression in weight gain. The best performance of chicks was obtained on the rations containing 2800 KCals/Kg diet. Feed intake was observed to be inversely related to energy content, although in most cases not significantly so at each protein and energy series. Generally birds were observed to meet their energy requirements. From these studies, a protein level of 23 or 26% and energy level of 2800 or 3000 K Cal/Kg diet may be tentatively recommended for a tropical country like Nigeria.

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