mportance of Cooling Holstein Cows During the Dry Period in Summer Months
نویسندگان
چکیده
منابع مشابه
Compromised liver functions during the breeding period of clinically healthy Holstein cows
Background: The sub-clinical carry-over effects of post-partum (PP) conditions and the problems independent of parturition may affect the cows’ performance during the breeding period. Aims: It was hypothesized that some mid-lactation cows may have compromised liver functions and calculating liver activity index (LAI; -1.5 to +1.5) may be helpful in detecting su...
متن کاملFactors Affecting the Dry Period Length and Its Effect on Milk Production and Composition in Subsequent Lactation of Holstein Cows
The study aimed to determine factors affecting the dry period length and effect of dry days on milk yield, milk composition and lactation length in the next lactation of dairy cows. Data used for analysis included 7264 lactation records collected from 2012 to 2016 on 4737 Holstein cows raised in 152 herds. The statistical model used to determine the factors influencing the dry period length sho...
متن کاملThyroid Hormones Concentrations during the Mid-Dry Period: An Early Indicator of Fatty Liver in Holstein-Friesian Dairy Cows
Relationship between postpartal fatty liver and thyroid gland activity during the peripartal and mid dry periods was studied. Twenty one dry cows were chosen. Blood samples were obtained on days -30, -2, and +12 related to calving and analized for thyroxine (T(4)) and triiodothyronine (T(3)). A T(3)/T(4) ratio was calculated. Liver tissue samples were taken 12 d after calving and tested for the...
متن کاملeffects of different dry period length on the reproductive and productive performance of holstein cows during the subsequent lactation
to evaluate the effects of different dry period lengths on milk yield, milk composition, reproductive performance and energy balance in dairy cows, 30 holstein breeds (average 270 days pregnant) were made use of in a randomized complete block design. cows were assigned to three treatments (60, 45 and 30 days of dry period) and two blocks as based on parity (either first lactation or multifariou...
متن کاملImproving Productive and Reproductive Performance of Holstein Dairy Cows through Dry Period Management
To determine the effects of dry period (DP) length on milk yield, milk composition, some blood metabolites, complete blood count (CBC), body weight and score and follicular status, twenty five primiparous and multiparous Holstein cows were assigned to a completely randomized design with DP-60 (n = 13) and DP-20 (n = 12) dry period lengths. Cows in the DP-60 produced more milk, protein, SNF, ser...
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ژورنال
عنوان ژورنال: Concepts of Dairy & Veterinary Sciences
سال: 2019
ISSN: 2637-4749
DOI: 10.32474/cdvs.2019.02.000137