Abstract
ABSTRACT The present study aimed to evaluate the effects of the transition period on hematological and biochemical constituents in Mangalarga Marchador mares. Forty-eight mares were used to form a maintenance group (MG) and transition group (TG), formed by pregnant mares and, after delivery, infants. Blood samples were collected at the following times: T-60 (60 d pre-delivery), T-30 (30 d pre-delivery), T-15 (15 d pre-delivery), T0 (first 6h post-delivery), T15 (15 d post-delivery), T30 (30 d post-delivery), and T60 (60 d post-delivery). The TG had lower values (P< 0.05) of red blood cells, hematocrit and hemoglobin at T0, T15, T30 and T60 times than MG. The mean corpuscular volume was lower in MG (P< 0.05) than in TG (T0, T15, T30 and T60) and mean corpuscular hemoglobin concentration was higher (P< 0.05) in MG than in TG (T15, T30 and T60). On the other hand, the diameter distribution of red blood cells presented a lower value (P< 0.05) in MG than in TG (T15 and T30). Mares in transition period presented regenerative anemia. The results demonstrate physiological metabolic variations of different intensities during pregnancy, delivery and early lactation.
Highlights
The transition period comprises the last third of pregnancy, parturition, and early lactation (Manso Filho et al, 2008), called the peripartum period (Aoki and Ishii, 2012; Mariella et al, 2014)
The present study aimed to evaluate the effects of the transition period on hematological and biochemical profiles of Mangalarga Marchador mares bred on pasture
The number of red blood cells in maintenance group (MG) was higher (P< 0.05) than that in transition group (TG) at T0, T15, T30 and T60, with the lowest value observed in the lactating mares at T30 (5.3±0.8)
Summary
The transition period comprises the last third of pregnancy, parturition, and early lactation (Manso Filho et al, 2008), called the peripartum period (Aoki and Ishii, 2012; Mariella et al, 2014) During this period, physiologic adaptations are observed in hematological constituents (Hadden and Mclaughlin, 2009). In the last trimester before delivery, there is an increase in the nutritional demand of the mare, making it more vulnerable to the development of diseases (Bazzano et al, 2014a) These metabolic changes are essential in order to meet maternal demands, ensure the development and proper growth of the fetus, and provide an energy reserve and necessary substrates after birth (Hadden and Mclaughlin, 2009). Studies with different equestrian breeds have been carried out in order to describe the main hematological characteristics of mares during this period (Bazzano et al, 2014b; Mariella et al, 2014), few Brazilian studies have addressed this topic, especially in the Mangalarga Marchador breed, which has great importance for the equine culture of Brazil and for the state of Minas Gerais, in which activities involving equines have significant social and economic dimensions
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