نتایج جستجو برای: parity number and calving season
تعداد نتایج: 16882918 فیلتر نتایج به سال:
Replacing toxic, wild-type Neotyphodium coenophialum-infected tall fescue (E+) with nontoxic, N. coenophialum-infected tall fescue (NE+) has improved cow performance, but producer acceptance of NE+ has been slow. The objective was to compare performance by spring- and fall-calving cows grazing either E+ or NE+ at different percentages of the total pasture area. Gelbvieh×Angus crossbred cows (n=...
In this study the causes of culling in 9 industrial dairy farms in northwest of Iran between 2008 to 2013 were investigated. The impact of various factors on culling was analyzed using the GLIMIX procedure of SAS 9.2. The results showed that from 5404 dairy cows culled, voluntary and involuntary culling rate were 24.8% and 75.2 % respectively. Infertility and metabolic disorders were the most f...
Long breeding seasons result in long calving seasons. This results in calvings distributed through a range of environmental and nutritional conditions and a disparity in calf maturity at any planned weaning time. It also results in cows entering their period of maximal nutritional requirements over the same range of environmental conditions. Attempts to increase cow and calf productivity often ...
The association of birth type (single vs. double) and pregnancy type (single vs. double) with lactation performance and lactation curve was investigated in Holstein cows in Iran. Data of 243298 lactations on 138021 cows in 261 herds collected during January 2000 to December 2012 were used. The average twinning rate was 3.64% and ranged from 1.44% (primiparous) to 5.41% (multiparous). Factors as...
Abstract The incidence of clinical mastitis (CM) in small and large-scale dairy cow farms can be highly variable affected by age, parity, post-calving status, atmospheric conditions. current study aimed to assess the CM-incidence its association with days, number lactations, season, udder quarters cows small-scale farms. was conducted within one calendar year 177 864 cows. Clinically confirmed ...
Environmental effects on fertility measures early in lactation, such as the interval from calving to first luteal activity (CLA), proportion of samples with luteal activity during the first 60 days after calving (PLA) and interval to first ovulatory oestrus (OOE) were studied. In addition, traditional measurements of fertility, such as pregnancy to first insemination, number of inseminations pe...
The data of 35 years from 1980 to 2014 were analyzed to study the effect of genetic and non-genetic factors viz. period of calving, season of calving as fixed effect and sire as random effect on the reproduction trait (age at first calving) of Kankrej cattle maintained at Livestock Research Station, S.D. Agricultural University, Sardarkrushinagar, Gujarat. The least square mean of age at first ...
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