Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season
The objective of this study was to evaluate the effects of supplements with different crude protein (CP) contents on grazing cattle intake, digestibility, ruminal fermentation pattern, and nitrogen (N) metabolism characteristics during the rainy season. Five ruminal and abomasal cannulated Holstein×...
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| Language: | English |
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Asian-Australasian Association of Animal Production Societies
2016-12-01
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| Series: | Asian-Australasian Journal of Animal Sciences |
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| Online Access: | http://www.ajas.info/upload/pdf/ajas-29-12-1710.pdf |
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| author | J. F. Figueiras E. Detmann M. O. Franco E. D. Batista W. L. S. Reis M. F. Paulino S. C. Valadares Filho |
| author_facet | J. F. Figueiras E. Detmann M. O. Franco E. D. Batista W. L. S. Reis M. F. Paulino S. C. Valadares Filho |
| author_sort | J. F. Figueiras |
| collection | DOAJ |
| description | The objective of this study was to evaluate the effects of supplements with different crude protein (CP) contents on grazing cattle intake, digestibility, ruminal fermentation pattern, and nitrogen (N) metabolism characteristics during the rainy season. Five ruminal and abomasal cannulated Holstein×Zebu steers (296 kg body weight, BW) were used in a 5×5 Latin square design. The animals grazed five signal grass paddocks (0.34 ha). The five treatments evaluated were: Control (no supplement) and 1.0 g of supplement/kg BW with 0, 330, 660, and 1,000 g of CP/kg as-fed. The supplement was composed of starch, soybean meal, urea, and ammonium sulphate. There was a positive linear effect (p≤0.033) of the CP content in the supplements on the organic matter (OM), CP, and digested OM intakes. The provision of supplements did not increase (p≥0.158), on average, total and ruminal digestibilities of OM and CP. However, the increase in CP content in the supplements caused a positive linear effect (p≤0.018) on ruminal digestibilities of OM and CP. Additionally, a quadratic effect of the CP contents of the supplements were observed (p = 0.041) for the ruminal digestibility of neutral detergent fiber corrected for ash and protein, with the highest estimate obtained with the CP content of 670 g/kg. The supply of supplements increased (p<0.001) the ruminal ammonia N concentration, which also changed linearly and positively (p<0.001) according to increase in CP content in the supplements. The apparent N balance and relative N balance (g/g N intake) were not, on average, changed (p≥0.164) by the supplements supply. However, both showed a tendency of a linear increase (p≤0.099) with increasing supplement CP content. The supplements increased (p = 0.007) microbial N production in the rumen, which also changed linearly and positively (p = 0.016) with increasing supplement CP content. In conclusion, protein supplementation in grazing cattle during the rainy season, while stimulating voluntary forage intake, results in higher efficiency of N utilization when compared to energy supplementation. This is a possible response to increased microbial protein synthesis in the rumen and improved N status in the animal body. |
| first_indexed | 2024-04-11T23:12:39Z |
| format | Article |
| id | doaj.art-fd00904b6b644a3c80ba385f9f22e469 |
| institution | Directory Open Access Journal |
| issn | 1011-2367 1976-5517 |
| language | English |
| last_indexed | 2024-04-11T23:12:39Z |
| publishDate | 2016-12-01 |
| publisher | Asian-Australasian Association of Animal Production Societies |
| record_format | Article |
| series | Asian-Australasian Journal of Animal Sciences |
| spelling | doaj.art-fd00904b6b644a3c80ba385f9f22e4692022-12-22T03:57:46ZengAsian-Australasian Association of Animal Production SocietiesAsian-Australasian Journal of Animal Sciences1011-23671976-55172016-12-0129121710171810.5713/ajas.16.012523522Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy SeasonJ. F. Figueiras0E. Detmann1M. O. Franco2E. D. Batista3W. L. S. Reis4M. F. Paulino5S. C. Valadares Filho6 Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, Brazil Institute of Agricultural and Environmental Sciences, Animal Science, Universidade Federal de Mato Grosso – Campus Sinop, Sinop, MT 78557-267, BrazilThe objective of this study was to evaluate the effects of supplements with different crude protein (CP) contents on grazing cattle intake, digestibility, ruminal fermentation pattern, and nitrogen (N) metabolism characteristics during the rainy season. Five ruminal and abomasal cannulated Holstein×Zebu steers (296 kg body weight, BW) were used in a 5×5 Latin square design. The animals grazed five signal grass paddocks (0.34 ha). The five treatments evaluated were: Control (no supplement) and 1.0 g of supplement/kg BW with 0, 330, 660, and 1,000 g of CP/kg as-fed. The supplement was composed of starch, soybean meal, urea, and ammonium sulphate. There was a positive linear effect (p≤0.033) of the CP content in the supplements on the organic matter (OM), CP, and digested OM intakes. The provision of supplements did not increase (p≥0.158), on average, total and ruminal digestibilities of OM and CP. However, the increase in CP content in the supplements caused a positive linear effect (p≤0.018) on ruminal digestibilities of OM and CP. Additionally, a quadratic effect of the CP contents of the supplements were observed (p = 0.041) for the ruminal digestibility of neutral detergent fiber corrected for ash and protein, with the highest estimate obtained with the CP content of 670 g/kg. The supply of supplements increased (p<0.001) the ruminal ammonia N concentration, which also changed linearly and positively (p<0.001) according to increase in CP content in the supplements. The apparent N balance and relative N balance (g/g N intake) were not, on average, changed (p≥0.164) by the supplements supply. However, both showed a tendency of a linear increase (p≤0.099) with increasing supplement CP content. The supplements increased (p = 0.007) microbial N production in the rumen, which also changed linearly and positively (p = 0.016) with increasing supplement CP content. In conclusion, protein supplementation in grazing cattle during the rainy season, while stimulating voluntary forage intake, results in higher efficiency of N utilization when compared to energy supplementation. This is a possible response to increased microbial protein synthesis in the rumen and improved N status in the animal body.http://www.ajas.info/upload/pdf/ajas-29-12-1710.pdfDigestibilityEnergyMetabolismNitrogenSupplementationTropical Forages |
| spellingShingle | J. F. Figueiras E. Detmann M. O. Franco E. D. Batista W. L. S. Reis M. F. Paulino S. C. Valadares Filho Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season Asian-Australasian Journal of Animal Sciences Digestibility Energy Metabolism Nitrogen Supplementation Tropical Forages |
| title | Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season |
| title_full | Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season |
| title_fullStr | Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season |
| title_full_unstemmed | Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season |
| title_short | Effects of Supplements with Different Protein Contents on Nutritional Performance of Grazing Cattle During the Rainy Season |
| title_sort | effects of supplements with different protein contents on nutritional performance of grazing cattle during the rainy season |
| topic | Digestibility Energy Metabolism Nitrogen Supplementation Tropical Forages |
| url | http://www.ajas.info/upload/pdf/ajas-29-12-1710.pdf |
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