Browsing by Subject "Dairy calf"

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    Dairy calf health and welfare in automated feeding systems in the upper Midwest USA
    (2016-08) Jorgensen, Matthew
    Automated feeding systems are growing in popularity for dairy farms in America, but little is known about how these systems are managed. This study investigated the usage of automated feeders, and the implications of management practices for calf morbidity and mortality. Barn design, environmental and management factors were determined on 38 farms in the upper Midwest USA through a combination of questionnaire and on-farm measurements. These measurements were used to describe the current management practices of farms, identify risk factors for adverse calf health outcomes and calf mortality, and to determine best practices for the use of automated feeders. Among factors measured, those associated with early life procedures (colostrum management, navel disinfection), grouping strategies (age of calves at grouping, stocking density, group size, and age difference between the oldest and youngest animals in the group), feeding management (peak milk allowance, days to reach peak milk allowance), milk contamination (bacterial counts in the liquid diet exceeding recommended levels), and seasonal climatic variation were significantly associated with calf health outcomes. Overall, the outcomes observed in this study indicate that automated calf feeding systems can be effectively managed to provide high quality care for preweaned animals, while more consistency is needed in colostrum management and automated feeder cleaning and maintenance. More research is needed to investigate the causal relationships between factors identified in this work with calf health outcomes, particularly focused on encouraging good postnatal practices, calf grouping strategies, bacterial contamination of the feeder unit and of milk delivered to calves, and strategies for the mitigation of calf health issues resulting from seasonal environmental changes
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    Feeding strategies during the nursery phase of dairy calves to promote increased gastrointestinal development efficiency and reduced weaning costs
    (2014-07) LaBerge, Rebekah
    Neonatal dairy calf nutritional strategies are constantly manipulated and explored as gastrointestinal development, growth, health, and cost are considered. Functional food incorporation is becoming increasingly important to eliminate fed antimicrobials. Alternative protein use is continuously research as competition for whey proteins increases. All programs need to result in the healthiest and well-grown calf possible, with a well-developed ruminant system before weaning, achieved by grain intake. These three studies investigate achieving these goals. Whey cream replacing a portion of conventional milk replacer (22% protein, 20% fat, DM basis) was successful with some tendencies for growth and health. The large amount (4% of BW) of high starch starter (38%) consumed by harvested calves showed signs of mild to moderate acidosis and gastrointestinal inflammation. A study replacing 5% of 22% whey protein with soy isolate led to similar performance and health when fed at a step-up method. A study comparing the interaction of medium chain fatty acids (MCFA) on the plane of nutrition with an accelerated (28% protein, 21% fat, DM basis), resulted in most benefits with MCFA was combined with a high plane of nutrition. Although starter intake was greater for the low plane of nutrition, high plane of nutrition had increased body weight gain because energy intake between the treatments was not similar until week 6 of life. Harvested calves in this study (week 3) yielded interesting results about when maturation of the gut may begin in relationship to grain intake.