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989  Articles
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The objective of this study was to show the risk factors affecting the conception rate in Holstein heifers after synchronization of estrus. A total of 275 Holstein heifers housed in a free barn were used for the experiment. The herd was visited regularly ... see more

This study monitored survival up to fourth calving and reasons to culling of a number of 202 Holstein Friesian heifers on research farm at Agricultural Research and Development Station (ARDS) Simnic, Craiova. Heifers born between 2016 and 2019 were monito... see more

Aim of study: To determine the reproductive performance of heifers gestated under maternal conditions of heat stress in late gestation.Area of study: Northern Mexico (25° 32’ N, 103° 23’ W).Material and methods: The study included reproductive records of ... see more

This study was initiated on 24 prepubertal Holstein x Kankrej crossbred heifers of nearly identical age (7-9 months) and body weight (130-140 kg) at University farm to evaluate the effect of high plane of nutrition on blood biochemical and minerals profil... see more

The aim of the study was to investigate the relationship between age at first calving (AFC) and subsequent fertility and survival up to third calving in Holstein Friesian heifers. Study comprised 116 consecutively born female calves from the same herd. Th... see more

The aim of this study was to evaluate growth and development of heifers from birth to 24 months of age and the effects on milk yield in first lactation. Body weight and height at withers of female calves (N=4167) were taken at monthly intervals. At 3 mont... see more

Genetic selection of dairy cattle has classically been based on fertility and productivity (kilograms of milk, protein, fat). In recent years a growing interest in characters related to health and efficiency of the animals has taken hold. The selection of... see more

The objective of this study was to evaluate the impact of age at first calving (AFC) and climatic conditions at calving on peripartum disorders and reproductive performance in Holstein heifers in a hot environment. A total of 3000 reproductive records fro... see more

The objective of this study was to evaluate the impact of age at first calving (AFC) and climatic conditions at calving on peripartum disorders and reproductive performance in Holstein heifers in a hot environment. A total of 3000 reproductive records fro... see more

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