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      Evaluación productiva y microeconómica de la aplicación de fuentes comerciales de somatotropina bovina en vacas de leche Translated title: Productive and microeconomic evaluation of commercial sources of bovine somatotropin application in dairy cows Translated title: Avaliação produtiva e microeconômica da aplicação de fontes comerciais de somatotropina bovina em vacas leiteiras

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          Abstract

          Con el objetivo de analizar el desempeño productivo y reproductivo de la aplicación de dos fuentes comerciales de somatotropina bovina recombinante (BST-r) se emplearon 30 vacas de la raza holstein friesian de 1 a 4 partos y entre 60 y 180 días en leche (DEL). Se midió la producción de leche (diaria), la incidencia de mastitis y la condición corporal (CC) (mensual), y en las vacas vacías el período abierto (PA). Para la producción de leche se utilizó un diseño completamente al azar con arreglo factorial 2 x 3 x 7 y una covariable, considerando como factores el parto (primíparas y multíparas); la hormona, grupo 1, BST-r1 (500 mg) + vitamina E (1665 UI) + lecitina (166.5 mg); grupo 2, BST-r2 (500 mg); y control, sin aplicación. El factor tiempo con siete niveles (aplicación 3 a 9). Los DEL al inicio del ensayo se tomaron como una covariable. Para evaluar el PA se utilizó un diseño completamente al azar con arreglo factorial 3 x 3, considerando como factores el número de parto (2, 3 y 4) y la hormona con los mismos tres niveles mencionados anteriormente. Los valores de CC fueron analizados por el método no paramétrico de Kruskal-Wallis, evaluando cinco momentos. La incidencia de mastitis se evaluó a partir de intervalos de confianza para la proporción de cuartos afectados con mastitis clínica y con grados de afección 1, 2 y 3 cruces. La hormona y los grupos de parto no tuvieron diferencias estadísticas significativas (p> 0.05), pero sí las aplicaciones (p<0.01) y los DEL iniciales (p<0.01). La aplicación de la hormona y el número de parto tuvieron una interacción estadísticamente significativa en el PA (p<0.05). La CC no presentó diferencia estadística significancia para los niveles del factor hormona (p> 0.05). Se dedujo ausencia de diferencias significativas entre todos los intervalos obtenidos para mastitis. Para el análisis microeconómico, se realizó una simulación proyectada a un año para cada uno de los grupos considerados y se estableció la relación beneficio/costo, donde el grupo que recibió BST-r2 presentó la mejor relación. No obstante, el tratamiento con la hormona aumentó el PA y generó pérdidas en producción.

          Translated abstract

          This study was proposed with the aim to analyze productive and microeconomic responses of holstein friesian cows that were treated with one of two commercial sources of recombinant bovine somatotropin (BST-r). Thirty cows form 1 to 4 parity and 60 to 180 days in milk (DIM) were evaluated. Daily milk production was recorded; incidence of mastitis and body condition score (BCS) were measured once a month. In addition, open days (OD) were measured in not pregnant cows at the begging of the study. Milk yield variable was analyzed by a completely randomized design with a factorial 2 x 3 x 7 arrangement plus a covariable. Factors considered in the model were: calving (primiparous or multiparous); hormone treatment: group 1, BST-r1 (500 mg) + vitamin E (1665 UI) + lecitine (166.5 mg), group 2, BST-r2 (500 mg), and control group without treatment; and time (application 3 to 9). DIM at the beginning of the study was used as a covariable. Open days (OD) variable was e by a completely randomized design with a 3 x 3 factorial arrangement. Factors considered in the model were parity (2, 3 or 4) and hormone treatment (with the same three levels above mentioned). The BCS variable was analyzed by the non-parametric Kruskal-Wallis method (five times). Hormone treatment or parity did not significantly differ (p> 0.05), although number of application (p<0.01) and DIM at the beginning (p<0.01) did. There was a significant effect of the interaction between hormone treatment and parity on OD variable (p<0.05). Neither BCS nor mastitis incidence showed significantly differences between treatment groups (p> 0.05). To perform the micro economical analysis, a one-year-projected-simulation was performed for each treatment group in order to establish a benefit/cost ratio, where BST-r2 treated group exhibited the best ratio. However, hormone treatment increased OD and induced economic losses in production process.

          Translated abstract

          Com o objetivo de avaliar o desempenho produtivo y reprodutivo da aplicação de duas fontes comerciais de somatotropina bovina recombinante (BST-r) foram utilizadas 30 vacas da raça Holstein Friesian de 1 a 4 partos e entre 60 e 180 dias em leite (DEL). Foram medidas a produção de leite (diária), a incidência de mastite e a condição corporal (CC) (mensal), e nas vacas vazias o período aberto (PA). Para a produção de leite foi utilizado um delineamento experimental completamente casualizado em arranjo fatorial 2 x 3 x 7 e uma covariável, considerando como fatores o parto (primíparas e multíparas); o hormônio, grupo 1, BST-r1 (500 mg) + vitamina E (1665 UI) + lecitina (166.5 mg); grupo 2, BST-r2 (500 mg); e controle, sem aplicação. O fator tempo com sete níveis (aplicação 3 a 9). Os DEL ao inicio do ensaio se tomaram como covariável. Para avaliar o PA foi utilizado um delineamento completamente casualizado em arranjo fatorial 3 x 3, considerando como fatores o número de parto (2, 3 y 4) e o hormônio com os mesmos níveis três níveis mencionados anteriormente. Os valores de CC foram analisados pelo método não paramétrico de Kruskal-Wallis, avaliando cinco momentos. A incidência de mastites se avaliou a partir de intervalos de confiança para a proporção de quartos afetados com mastite clínica e com graus de afeção 1, 2 e 3 cruzes. O hormônio e os grupos de parto não tiveram diferenças estadísticas significativas (p> 0.05), porém se as aplicações (p<0.01) e os DEL iniciais (p<0.01). A aplicação do hormônio e o número de parto tiveram uma interação estatisticamente significativa no PA (p<0.05). A CC não apresentou diferença estatisticamente significativa para os níveis do fator hormônio (p> 0.05). Deduz-se ausência de diferenças significativas entre todos os intervalos obtidos para mastites. Para a análise microeconômica, se realizou uma simulação projetada a um ano para cada um dos grupos considerados e se estabeleceu a relação beneficio/custo, onde o grupo que recebeu BST-r2 apresentou a melhor relação. Contudo, o tratamento com o hormônio aumento o PA e gerou perdas em produção.

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          Most cited references35

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          A Dairy Cow Body Condition Scoring System and Its Relationship to Selected Production Characteristics

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            Follicular function in lactating dairy cows treated with sustained-release bovine somatotropin.

            The objective of this study was to determine the long-term, short-term, and residual effects of bovine somatotropin (bST) on ovarian function. Twenty-six Holstein cows were assigned to one of four groups and given either bST (500 mg) or saline for seven injection cycles (14 d between injections). Groups were 1) seven injection cycles of saline (control), 2) seven injection cycles of bST, 3) three injection cycles of bST followed by four injection cycles of saline, and 4) three injection cycles of saline followed by four injection cycles of bST. Beginning in the middle of the fourth injection cycle, an estrous cycle was synchronized for study. Serum concentrations of bST and insulin-like growth factor I were lowest during saline injections and increased after bST injections. Growth of the first wave dominant follicle was similar; however, start of the second follicular wave was approximately 48 h earlier in those cows treated with bST (groups 2, 3, and 4). Cows treated with somatotropin had a similar pattern of follicular growth, but tended to have more class 1 (3 to 5 mm) follicles and had more class 2 (6 to 9 mm) follicles than did the control cows. Peak concentrations of serum FSH were lower and occurred earlier for the cows treated with bST. There were no differences in the long-term or short-term effects of bST on ovarian function. Furthermore, cows that were switched from bST to saline (group 3) showed a residual effect of bST for up to 3 wk.
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              Effect of 188-Day Treatment with Somatotropin on Health and Reproductive Performance of Lactating Dairy Cows,

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                Author and article information

                Journal
                rccp
                Revista Colombiana de Ciencias Pecuarias
                Rev Colom Cienc Pecua
                Facultad de Ciencias Agrarias, Universidad de Antioquia (Medellín, Antioquia, Colombia )
                0120-0690
                2256-2958
                March 2008
                : 21
                : 1
                : 27-38
                Affiliations
                [03] Medellín orgnameEjercicio particular Colombia
                [02] Medellín orgnameUniversidad Nacional de Colombia, sede Medellín orgdiv1Facultad de Ciencias Agropecuarias Colombia
                [01] Medellín orgnameUniversidad de Antioquia orgdiv1Facultad de Ciencias Agrarias orgdiv2Grupo de Investigación en Ciencias Animales (GRICA) Colombia
                Article
                S0120-06902008000100004 S0120-0690(08)02100104
                225a1f68-cdc4-4775-9199-0e9de6242100

                This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.

                History
                : 31 January 2008
                : 05 August 2006
                Page count
                Figures: 0, Tables: 0, Equations: 0, References: 35, Pages: 12
                Product

                SciELO Colombia

                Categories
                Articulos Originales

                período abierto,condición corporal,incidencia de mastitis,producción de leche,relación beneficio/costo en lecherías,body condition score,mastitis incidence,milk production,open days,relationship benefit/cost,condição corporal,incidência de mastites,período aberto,produção de leite,relação beneficio/custo em leiterias

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