Sökning: "dairy cows"

Visar resultat 21 - 25 av 86 avhandlingar innehållade orden dairy cows.

  1. 21. Roughage Feeding of Suckler Cows during Winter : intake, utilization and energy status in pregnant cows

    Författare :Mikaela Jardstedt; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Feeding late cut forage is a common strategy to provide pregnant suckler cows with feed of suitable nutritional quality during ad libitum feeding regimes. Despite this method, commonly grown grasses may result in overfeeding with energy and protein in relation to cow nutrient demands. LÄS MER

  3. 22. Effects of increasing the proportion of high-quality grass silage in the diet of dairy cows

    Författare :Mikaela Lindberg; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : The Swedish dairy cow has almost doubled its annual milk yield over a few decades. This has simultaneously led to an increase in the dietary proportion of concentrate in order to meet the increased nutritional requirement of dairy cows. LÄS MER

  4. 23. α-tocopherol and β-carotene in forages and their utilisation by dairy cows in organic production

    Författare :Hanna Lindqvist; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : There are large variations in α-tocopherol (vitamin E) and β-carotene (pro-vitamin A) concentrations in forages. α-Tocopherol and β-carotene are antioxidants and important for the health and fertility of cows. LÄS MER

  5. 24. Indicators of mastitis and milk quality in dairy cows : data, modeling, and prediction in automatic milking systems

    Författare :Dorota Anglart; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Methods for generating predictions of important and generally accepted indicators of udder inflammation and poor milk quality, such as somatic cell count (SCC) or changes in milk homogeneity, are few. The aim of this thesis was to investigate methods to identify indicators of mastitis and poor milk quality in dairy cows using data generated by automatic milking systems (AMS). LÄS MER

  7. 25. Extended voluntary waiting period before first insemination in primiparous dairy cows : effects on milk production, fertility, and health

    Författare :Anna Edvardsson Rasmussen; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
    Nyckelord :LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES;

    Sammanfattning : Extension of the voluntary waiting period (VWP) before first insemination after calving, could decrease the frequency of demanding transition periods both at cow and herd level. In the initial study of this thesis, the cows were randomized to an extended (155-205 d) or conventional (35-85 d) VWP and assessed during their first and second lactation. LÄS MER