Author:
LÓPEZ-GONZÁLEZ FELIPE,VALDÉS JAIR JESÚS SÁNCHEZ,YONG-ÁNGEL GILBERTO,CASTELÁN-ORTEGA OCTAVIO ALONSO,ESTRADA-FLORES JULIETA GERTRUDIS
Abstract
The objective of the present study was to evaluate the effects of different levels of concentrate on the productive response of grazing dairy cattle and to determine voluntary forage intake. The experiment was carried out in a 4×4 Latin square design repeated three times, in which different inclusion levels of experimental concentrate were evaluated (EC) vs commercial concentrate (CC). The treatments were as follows: EC1= 7.12 kg DM of EC + grazing, EC2=6.23 kg DM of EC+ grazing, EC3=5.34 kg DM of EC+ grazing, CC=7.12 DM kg of a commonly used commercial concentrate (CC), and free-access grazing. The voluntary intake was determinate throw n-alkanes technique. The variables evaluated in cattle were milk output, live weight, and body condition; milk samples were also taken to determine protein and fat contents. Net herbage accumulation (NHA), forage height, neutral detergent fiber (NDF), acid detergent fiber (ADF), digestibility of organic matter (DIVMO), and metabolizable energy (ME) of pasture grasses were evaluated in addition to voluntary intake and production costs. Significant differences in crude protein content were found between the evaluation periods but were not found for NDF, ADF, DIVMO, NHA, and ME. Significant differences were not found in voluntary intake but were present in total intake. The evaluated treatments did not differ with respect to animal response. Finally, significant differences were found in milk output. Greater milk production was obtained in treatments 1 and 2 (14.92 and 14.50 kg/day/animal, respectively.
Publisher
Indian Council of Agricultural Research, Directorate of Knowledge Management in Agriculture
Subject
General Veterinary,Animal Science and Zoology
Reference29 articles.
1. AFRC. 1993. Energy and Protein Requirements for Ruminants, 159 pp. An advisory manual prepared by the AFRC technical committee on response to nutrients, CAB International, Wallinford, UK.
2. Absalón-Medina V A, Blake R W, Fox D G, Juárez-Lagunes F I, Nicholson C F, Canudas-Lara E G and Rueda-Maldonado B L. 2012. Limitations and Potentials of dual-purpose cow herds in Central Coastal Veracruz, Mexico. Tropical Animal Health and Production 44: 1131–42.
3. Albarrán-Portillo B, Rebollar-Rebollar S, García-Martínez A, Rojo-Rubio R, Avilés-Nova F and Arriaga-Jordán C M. 2015. Socioeconomic and productive characterization of dualpurpose farms oriented to milk production in a subtropical region of Mexico. Tropical Animal Health and Production 47: 519–23.
4. Ankom Technology. 2004. In vitro true digestibility using the DAISY II Incubator. Ankom Technology Method 3. (http:// www.ankom.com/Accessed 10 October 2017).
5. AOAC. 1990. Protein (crude) in animal feed. Copper catalyst kjeldahl method. Official Method of Analysis of The Association of Official Analytical Chemists. 15th edn, p. 74. Arlington, Virginia.
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