Effects of Levels of Crude Protein on Performance of Growing Boars

Luce, W. G.; Johnson, R. K.; Walters, L. E.

doi:10.2527/jas1976.4251207x

Cited by 7 publications

(11 citation statements)

References 2 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Five trials with a total of 432 Duroc, Hampshire, Yorkshire and Duroc • Hampshire boars were utilized as the complete data base for this study, although the mean performance of boars in trials 1 and 2 has been published earlier (Luce et al, 1976). In trials 1, 2 and 3, 108 boars were allotted to three treatments; 54 boars were allotted to three treatments during trials 4 and 5.…”

Section: Methodsmentioning

confidence: 99%

“…Protein levels in the diet were reduced for each pen individually as the averaged 54.4 kg and boars removed from test weekly as kg. Ultrasonic estimates of boars in the pen were individually they reached 100 backfat thickness and longissimus muscle area were obtained as described by Luce et al (1976).…”

Section: Methodsmentioning

confidence: 99%

“…Methods of data collection, management and facilities were the same for each individual trial and have been defined by Luce et al (1976).…”

Section: Methodsmentioning

confidence: 99%

“…Similarly, Reinhard et al (1976) using corn-soybean meal based diets, observed a curvilinear response in gain and feed:gain (F:G) ratio in growing boars fed dietary protein levels from 14 to 22%, and Traverner et al (1977), using wheat-soybean meal-meat and bone meal based diets, observed a curvilinear increase in gain of boars fed protein levels between 14 and 23%. Luce et aL (1976), using corn-soybean meal based diets, reported a linear increase in gain 364 JOURNAL OF ANIMAL SCIENCE, Vol. 57, No.…”

mentioning

confidence: 99%

See 3 more Smart Citations

The Effects of Level of Crude Protein on Performance of Growing Boars

Tyler

Luce

Johnson

et al. 1983

Journal of Animal Science

Self Cite

View full text Add to dashboard Cite

Five trials involving 432 growing boars were utilized to study the effects of six levels of crude protein on gain, feed efficiency, feed intake, backfat thickness and longissimus muscle area. The boars were fed ad libitum either a 14, 16, 18, 20, 22 or 24% crude protein diet from about 24.6 to 54.4 kg (period 1). From 54.4 to 98.8 kg (period 2), the crude protein in each diet was reduced by 2%. During period 1, gain increased and feed to gain ratio decreased quadratically (P<.05)with increasing dietary crude protein in corn-soybean meal based diets and were maximum at protein levels of 20 to 22%. Feed intake was not affected by dietary protein level. During period 2, protein level did not significantly affect rate of gain, feed efficiency or feed intake. Overall, gain increased quadratically (P<.05)with increasing protein levels and was maximum for boars fed the 20/18% protein sequence during periods 1 .and 2, respectively. Feed to gain ratio decreased linearly (P<.05) with increasing dietary protein intake. Feed intake was not affected by dietary protein level. Scan backfat thickness and longissimus muscle area obtained at the end of the trial indicated that backfat decreased linearly (P<.05) with increasing protein intake, while longissimus muscle area increased quadratically (P<.05) as protein in the diet increased. These results indicate that small improvements in average daily gain, feed efficiency, longissimus

show abstract

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

“…Methods of data collection, management and facilities were the same for each individual trial and have been defined by Luce et al (1976).…”

Section: Methodsmentioning

confidence: 99%

mentioning

confidence: 99%

See 2 more Smart Citations

The Effects of Level of Crude Protein on Performance of Growing Boars

Tyler

Luce

Johnson

et al. 1983

Journal of Animal Science

Self Cite

View full text Add to dashboard Cite

show abstract

“…Feed/ gain was lower (P<.05) during the growing phase for pigs fed the higher sequence and overall favored (P<.10) pigs fed the higher sequence. Speer et al (1957), Creswell et al (1975) and Luce et al (1976) reported improved daily gain and reduced feed per unit of gain when boars were fed protein at levels higher than suggested by the NRC for barrows and gilts. Reinhard et al (1976), in a study of boars, gilts and barrows during the growing phase, and Fammatre et al (1977), in a trial with barrows and gilts in the finishing phase, found no improvement in growth rate and feed/ gain when higher-than-NRC-suggested protein levels were fed.…”

Section: Resultsmentioning

confidence: 99%

Phosphorus in Swine. IV. Influence of Dietary Calcium and Phosphorus and Protein Levels on Feedlot Performance, Serum Minerals, Bone Development and Soundness Scores in Boars

Kornegay

Thomas

Baker

1981

Journal of Animal Science

View full text Add to dashboard Cite

The effects of three dietary Ca and P levels and two protein levels on feedlot performance, serum minerals, bone development and soundness scores were evaluated in two trials with 192 crossbred boars. The following factorial arrangement of treatments was used in each trial: (1) 16-14% protein sequence -100% of NRC-recommended Ca and P levels for market barrows and gilts; (2) 16-14% protein -125% Ca and P; (3) 16-14% protein -150% Ca and P; (4) 18-16% protein sequence -100% Ca and P; (5) 18-16% protein -125% Ca and P, and (6) 18-16% protein -150% Ca and P. There were no overall differences in dai'.s g, in, daily feed intake and feed per unit of gain between boars fed diets containing 100, 125 and 150% Ca and P. During the growing phase, daily gain was higher (P<.10) and feed/gain lower (P<.01) for pigs fed 125% Ca and P. Although daily gain favored (P<.01) pigs fed the higher protein sequence during the growing phase, there was no overall difference. Feed/gain was lower (P<.05) during the growing phase for pigs fed the higher protein sequence, but there was no difference during the finishing phase. Dietary Ca and P • protein interactions were not significant. Serum P decreased (P<.01) as dietary Ca and P increased, with no difference in serum Ca and Mg, and there was no effect of tAppreciation is expressed to Charlie Babb and Carl Eure for feeding and caring for the pigs; to Helen protein sequence. Values for metacarpal parameters increased as dietary Ca and P level increased, although the magnitude of the increase was small. Except for length and ash values which were lower for pigs fed the high protein sequence, the values for metacarpal parameters were not influenced by protein sequence. Pad, soundness and foot scores and toe lesions and measurements were not generally influenced by dietary Ca and P or protein level. These results provide limited evidence that feedlot performance and bone development of boars were improved when 125% NRC Ca and P levels were fed, but that overall soundness and foot scores and toe lesions and measurements were unaffected. There was little support for the feeding of higher Ca and P levels. With the exception of feed efficiency during the growing phase, no parameter was improved by the feeding of the higher protein sequence. There appears to be no interaction between dietary Ca and P and protein levels. (

show abstract

Effect of different amino acid patterns on semen quality of boars fed with low-protein diets

Ren

Cheng

et al. 2015

Animal Reproduction Science

View full text Add to dashboard Cite

Effects of Levels of Crude Protein on Performance of Growing Boars

Cited by 7 publications

References 2 publications

The Effects of Level of Crude Protein on Performance of Growing Boars

The Effects of Level of Crude Protein on Performance of Growing Boars

Phosphorus in Swine. IV. Influence of Dietary Calcium and Phosphorus and Protein Levels on Feedlot Performance, Serum Minerals, Bone Development and Soundness Scores in Boars

Effect of different amino acid patterns on semen quality of boars fed with low-protein diets

Contact Info

Product

Resources

About