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Slow-release urea in diets for lactating crossbred cows
| Content Provider | Semantic Scholar |
|---|---|
| Author | Santiago, Bruno Tadeu Leonel, Fernando De Paula Zervoudakis, Joanis Tilemahos Araujo, Raphael Pavesi Machado, Henrique N. Moreira, Leonardo Oliveira, T. De |
| Copyright Year | 2015 |
| Abstract | The objective of this study was to evaluate the performance of F1 (Holstein × Zebu) cows in lactation according to different levels of substitution of soybean meal for a protein equivalent non-protein nitrogen originated from slow-release urea (SRU). Eight F1 (Holstein × Zebu) cows in the first third of lactation, with an average milk yield of 12.7 kg (±3.1 kg)/day and a live weight of 552 kg (±30 kg), were used. The experimental design was composed of two simultaneous 4 × 4 Latin squares, with the following treatments: 100% soybean meal and 0% SRU; 66% soybean meal and 34% SRU; 34% soybean meal and 66% SRU; and 0% soybean meal and 100% SRU. Sorghum silage, used as roughage, was supplied together with the concentrate. Feed intake and digestibility as well as milk yield and milk composition were measured. The obtained data were subjected to analysis of variance, adopting a 5% probability level. No intake variable showed significant differences among the treatments, and the mean values for the intakes of dry matter (DM), crude protein (CP) and neutral detergent fiber (NDF) were 18.35 2.62 and 5.85 kg/day, respectively. The results for apparent digestibility also did not show differences among treatments, with DM, CP and NDF averaging 58.16, 58.64 and 36.21%, respectively. Milk yield and composition were similar among the treatments. The average 4%-fat-corrected milk yield was 13.39 kg/animal.day. Intake, digestibility and milk yield and composition variables are not changed according to the substitution of the soy protein for slow-release urea. Thus, for average-milk-yield crossbred animals, this substitution depends on economic variables only. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | http://www.scielo.br/pdf/rbz/v44n5/1806-9290-rbz-44-05-00193.pdf |
| Language | English |
| Access Restriction | Open |
| Subject Keyword | Bos indicus Congenital Fiber Type Disproportion Design of experiments Detergents Dry Eye Syndromes Lactation Milk (body substance) Neuritis, Autoimmune, Experimental Optical fiber Platelet Glycoprotein 4, human Providing (action) Sample Variance Search/Retrieve via URL Silage Soy Proteins Soybeans Staphylococcal Protein A Tissue fiber Urea |
| Content Type | Text |
| Resource Type | Article |
