| Autor: |
de Albuquerque Saraiva T; Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Bom Pastor Avenue, s/n, Boa Vista, Garanhuns, PE, 55292-270, Brazil., de Figueiredo Monteiro CC; State University of Alagoas, BR 316, km 87,5, Santana do Ipanema, Alagoas, 57500-000, Brazil., Feitosa EMS; Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Bom Pastor Avenue, s/n, Boa Vista, Garanhuns, PE, 55292-270, Brazil., de Oliveira Moraes GS; Department of Animal Science, Federal Rural University of Pernambuco, Dom Manoel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., Netto AJ; Department of Animal Science, Federal Rural University of Pernambuco, Dom Manoel de Medeiros Street, s/n, Dois Irmãos, Recife, PE, 52171-900, Brazil., Cardoso DB; Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Bom Pastor Avenue, s/n, Boa Vista, Garanhuns, PE, 55292-270, Brazil. daniel.cardosozootecnista@gmail.com., Magalhães ALR; Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Bom Pastor Avenue, s/n, Boa Vista, Garanhuns, PE, 55292-270, Brazil., de Melo AAS; Academic Unit of Garanhuns, Federal Rural University of Pernambuco, Bom Pastor Avenue, s/n, Boa Vista, Garanhuns, PE, 55292-270, Brazil. |
| Abstrakt: |
The aim of this study was to investigate the replacement effect of cactus cladodes with cassava root and corn silage (CRCS) (0, 25, 50, 75, and 100%, dry matter basis) in diets of lactating dairy cows on nutrients intake and digestibility, microbial protein synthesis, nitrogen balance, and milk yield. Ten Holstein cows with an average milk yield of 16 kg/day, an initial body weight (BW) of 670 ± 35 kg, and an average of 17 weeks in milking were assigned to an experiment using a double 5 × 5 Latin square design. The ratio of forage/concentrate was 82:18, and the ingredients used were cactus cladodes, cassava root, corn silage, soybean meal, wheat meal, urea, and mineral premix. The intake of dry matter, organic matter, and total digestible nutrients were not influenced by the replacement levels. On the other hand, the intake of crude protein and neutral detergent fiber increased while the intake of non-fiber carbohydrates decreased with addition of CRCS. The digestibility of the nutrients was not changed as the milk yield as fat-corrected milk production and milk content of fat, protein, lactose, and total solids. The microbial protein synthesis, microbial protein efficiency, nitrogen balance, and efficiency of N in milk were not changed. Therefore, we recommend the complete replacement of cactus cladodes by cassava root and corn silage in the diets of lactating cows with an average milk yield of 16 kg/day. |
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