Aplicação da técnica de momentos invariantes no reconhecimento de padrões em imagens digitais

Abstract

The stage of lactation strongly influences the lameness cost. In the current study 741 Holstein cows that calved in 2005 are monitored during the first 240 d of lactation. It was recorded the lameness occurred in the 120 d post-partum and analysed reproductive performances of both lame and healthy cows. During this period lameness incidence was 18.85%, with an increasing number of case proportional to the number of lactation. Lame cows at 240 DIM had lower pregnancy percentage (61.72% vs 78,95%, p<0.0001), a calve-to-conception interval 26.7 d longer (138.3 vs 111.5 d, p<0.001), a higher service for conception number (2.91 vs 2.41, p<0.015) and a lower pregnancy percentage at the first service (14.06% vs 28.86%, p<0.014). In particular, primiparous cows were the animals that suffered more from lameness effects, extending their calve-to-conception interval of 38 days. At the cost of 2.5 Euro/day open, the economical loss due to lameness occurring in the first 120 DIM is 67 Euro/case (95 Euro/case for the primiparous cows). Lameness economical impact on fertility shows the need of differentiating the cost of disease according to the stage of lactation.