973 resultados para VACAS HOLSTEIN - ALIMENTACIÓN


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Thesis (doctoral)--Friedrich-Wilhelms-Universitat zu Berlin.

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Thesis (doctoral)--Universitat Rostock.

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Vols. 12-13, 15, 19-20 contain: Advanced register, v. 5-6, 8, 12-13.

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16th-<27th> annual meetings held at Syracuse, N.Y.

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Thesis (doctoral)--Friedrich-Alexanders-Universitat Erlangen.

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Thesis (doctoral)--Friedrich-Alexanders-Universitat Erlangen.

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La ponencia se constituye en torno a las problemáticas de la producción campesina y su interrelación con la naturaleza dentro del proceso de producción agrícola, así como a su vinculación con ambientes frágiles y procesos de degradación ambiental. En las producciones campesinas la naturaleza es un elemento importante, no sólo porque permite la materialización y el desarrollo de la base de sus recursos productivos, sino porque siempre se encuentran en constante interacción, implicando una transformación mutua. En este sentido, el proceso de trabajo es un proceso social y creativo de construcción de productos finales y prácticas sociales bien ajustadas, dentro del cual confluyen el encuentro con la naturaleza, la integración de diferentes ciclos en un todo coherente, el aprendizaje y el diseño de nuevas maneras de hacer las cosas. Generalmente, en ambientes frágiles los campesinos no consiguen desarrollar una base de recursos adecuada para una sostenibilidad ambiental y social. El presente estudio de caso analiza la ganadería familiar de la zona alta del valle de Los Pericos (Jujuy), focalizando en la relación que establece con la naturaleza en el proceso de trabajo, tanto desde su aspecto material como simbólico, así como las transformaciones por las que ha atravesado

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The objective was to evaluate the effect of lactation order, racial composition and milk production in the body condition score (BCS) at prepartum and its variation at postpartum. Furthermore, evaluate the effect of BCS at prepartum and its variation at postpartum on reproductive performance in dairy cows. Data was collected, relating to 470 parturitions for two years at 3 properties in Gurinhatã-MG. Milk production was measured monthly and the evaluation of the BCS was made by a single individual in the prepartum and postpartum (from 1.0 to 5.0). Was used the conventional artificial insemination, timed artificial insemination and controlled ride. The pregnancy diagnosis was through rectal palpation from 40 days after the service. The variables were analyzed using the SAS GLIMMIX procedure. The racial composition affected the BCS at prepartum (P=0.0003). Milk production tended to affect the BCS at prepartum (P=0.0957) and its variation in postpartum (P=0.1179). The overall conception rate was 57.3% and was affected (P<0.0001) by type of service. There was no effect of the BCS in prepartum (P=0.1544) and the variation of BCS (P=0.3127) on conception rate. Had no effect of BCS interaction at prepartum (P=0.9516) and the variation of BCS (P=0.9506) with the type of service on conception rate. The BCS at prepartum affect the service period (P<0.0001). Cows with BCS less than 3.25 became pregnant earlier. The variation of the BCS affected the service period (P<0.0001). Cows with loss of ECC became pregnant earlier than cows without loss. The average loss of ECC at postpartum was -0.692 points, not enough to damage the reproductive performance of dairy cows.