RESUMO
ABSTRACT: This study aimed to evaluate the economic efficiency of DD treatment on milk yield in lame cows suffering from DD. A total of 33 Holstein dairy cows with DD were included in the study. The milk yields were assessed as (1st); beginning milk production (BMP), (2nd); peak milk production before the diagnosis (PMPBD), (3rd); diagnosis day milk production (DMP), and (4th); post-treatment milk production (TMP). In the first stage of analyses, using the E-views equity test of means program, cows were classified into three groups for diagnosis time of DD according to the day in milk (DIM) (Group 1: 0 ≤ DIM ≤ 50, Group 2: 51 ≤ DIM ≤ 100, and Group 3: 101 ≤ DIM ≤ 150). Analysis of variance (ANOVA F-Test) and the Welch F-Test were conducted to compare the means of TMP to BMP, PMPBD, and DMP. Differences between TMP and DMP were statistically significant in all three groups. In the second stage of analyses, a cost-benefit analysis was conducted to determine the break-even point for each group to cover treatment costs for increasing milk yield. The DIM of DMP was considered as the gained milk yield per cow. Treatment cost and the mean break-even DIM for each group was then calculated. After treatment, the mean optimum break-even day for Groups 1, 2, and 3 was determined as 18.68, 26.43, and 27.14, respectively. Results suggested that treatment of DD may be considered as favorable and useful for a dairy economy.
RESUMO: Esse estudo tem o objetivo de avaliar a eficiência econômica no tratamento da DD na produção de leite em vacas tratadas com claudicao. Foram incluidas no total 33 vacas leiteiras Holstein com DD nesse estudo. A produção de leite foi avaliada (1°); início da produção de leite (BMP), 2°; pico na produção de leite antes do diagnostico (PMPBD), (3°); dia de diagnostico da produção de leite (DMP), e (4°); produção de leite pós-tratamento (TMP). Na primeira etapa das análises, utilizamos o programa E-views Equity Test of Mean, as vacas foram classificadas em três grupos para o tempo de diagnostico de DD Segundo o dia do leite (DMI) (Grupo 1: 0 ≤ DIM ≤ 50, Grupo 2 : 51 ≤ DIM ≤ 100 e Grupo 3: 101 ≤ DIM ≤ 150).A análise de variância (ANOVA F-Test) e o Welch F-Test foram conduzidos para comparar as medias de TMP a BMP, PMPBD e DMP. Diferenças entre TMP e DMP foram estatisticamente significativas nos três grupos. No segundo estágio das análises, uma análise de custo-benefício foi realizada para determinar o ponto de equilíbrio para cada grupo para cobrir os custos de tratamento e aumentar a produção de leite. O DIM de DMP foi considerado como a produção de leite adquirida por vaca. O custo do tratamento e o DIM médio de equilíbrio para cada grupo foram então calculados. Após o tratamento, o dia de equilíbrio ideal médio para os Grupos 1, 2 e 3 foi determinado como 18,68; 26,43 e 27,14, respectivamente. Os resultados sugerem que o tratamento de DD pode ser considerado favorável e útil para uma economia leiteira.
RESUMO
Objective. The aim of this field trial was to investigate the relationships among subclinical laminitis, hematological, ruminal and faecal alterations. Materials and Methods. To this extent dairy cows presenting subclinical laminitis (n=11) and to those of other healthy cows without laminitis (n=10) were enrolled and assigned into two groups. All animals were receiving the same daily ration formulated to contain 47% cornsilage and 18% hay, mainly. Effects of subclinical laminitis challenges on measurements of feces, and blood samples, were investigated to determine which of these measurements may aid in the diagnosis. pH changes in ruminal fluid collected via rumenocentesis were measured. Besides the following parameters were also measured; blood pH, faecal pH and faecal scoring. Blinded investigators performed the sample collection. Results. No statistical differences between the groups were detected for blood gas values studied regarding pCO2, HCO3, BE, indeed mean that pO2 values decreased statistically (p<0.05) and faecal pH was significantly decreased (p<0.05) in cows with subclinical laminitis in contrast to healthy controls. Conclusions. pO2 values and faecal pH may be valuable as indirect indicators of subclinical laminitis in cattle.
Objetivo. El objetivo de esta prueba de campo fue investigar las relaciones entre la laminitis subclínicay alteraciones hematológicas, ruminales y fecales. Materiales y métodos. Las vacas lecheras que presentaron laminitis subclínica (n=11) y las vacas sanas sin laminitis (n=10) fueron reclutadas y asignadas en dos grupos. Todos los animales recibieron la misma ración diaria que contenía 47% de ensilaje de maíz y 18% de heno, principalmente. Los efectos de la laminitis subclínica sobre las mediciones de las heces y muestras de sangre, fueron investigados para determinar cuál de estas mediciones pueden ayudar en el diagnóstico. Se midieron los cambios de pH en el fluido ruminal recogido a través rumenocentesis. Además, también se midieron los siguientes parámetros; pH de la sangre, el pH fecal y la puntuación fecal. La toma de las muestras se realizó a doble ciego. Resultados. No se detectaron diferencias significativas entre los grupos para los valores de los gases sanguíneos estudiados en relación con la pCO2, HCO3, BE; lo que significa que los valores de pO2 disminuyeron estadísticamente (p<0.05) y que el pH fecal se redujo significativamente (p<0.05) en las vacas con laminitis subclínica; en contraste con los controles sanos. Conclusiones. Los valores de pO2 y pH fecal pueden ser valiosos como indicadores indirectos de la laminitis subclínica en el ganado.