نتایج جستجو برای: calving month

تعداد نتایج: 145034  

2016
L.V. Randall M.J. Green M.G.G. Chagunda C. Mason L.E. Green J.N. Huxley

The importance of lameness in primiparous dairy heifers is increasingly recognised. Although it is accepted that clinical lameness in any lactation increases the risk of future lameness, the impact of foot lesions during the first lactation on long-term lameness risk is less clear. This retrospective cohort study aimed to investigate the impacts of foot lesions occurring around the time of firs...

Journal: :Journal of animal science 2016
H L Bradford B O Fragomeni J K Bertrand D A L Lourenco I Misztal

This study evaluated the impact of region and season on growth in Angus seed stock. To assess geographic differences, the United States was partitioned into 9 regions based on similar climate and topography related to cow-calf production. Seasonal effects were associated with the month that animals were weighed. The American Angus Association provided growth data, and records were assigned to r...

Journal: :Journal of dairy science 2007
J P Valde M L Lystad E Simensen O Østerås

Feeding practices, ration composition, and body condition scores (BCS) were assessed in an observational case-contrast study of Norwegian dairy herds with low (n = 98) and high (n = 94) mastitis infection rates. Differences between the 2 groups of herds were associated with feeding practices and amount of roughage. More herds in the low-infection group were fed a reduced amount of roughage at d...

2010
O. Messine L. J. M. Schwalbach D. A. Mbah A. L. Ebangi

The effects of non-genetic factors (sex of calf, calf birth weight, age of cow, season of calving) affecting gestation length (GL) and open days period (OP) in the Ngaoundere Gudali cattle of the Adamawa (Cameroon) was investigated. Mean GL was 293.4 ± 0.4 d. Sex of the calf significantly (P< 0.05) affected GL, with male calves being carried in utero approximately 3 days longer than the females...

Journal: :تولیدات دامی 0
مهشید محمدپناه کارشناس ارشد، گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه بیرجند، بیرجند، ایران همایون فرهنگ فر استاد گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه بیرجند، بیرجند، ایران مسلم باشتنی دانشیار گروه علوم دامی، دانشکدۀ کشاورزی، دانشگاه بیرجند، بیرجند، ایران

correlation between breeding value of crude milk (cm) and energy-corrected milk (ecm) was studied based on a total of 774,013 test day records belongs to 88,456 first-parity holsteins dairy cattle calving during 1997-2009 in 165 herds (from six provinces). genetic analysis of the traits was carried out by a fixed regression test day model. in the model, effects of herd, calving year, production...

1999
D. Boichard

The relationship between initial Somatic Cell Count (SCC) and time to first clinical mastitis was estimated from data including 20,422 Holstein heifers, without clinical signs of mastitis during the first month of lactation and with a first test day SCC lower than 400,000 cells /ml. Number of days from 35 days after first calving to first clinical mastitis event in first or second lactation was...

In this study, appropriate genetic co (variance) structure across ages of milk production in the Iranian Holstein cows was modeled using 35167 records originated from 1098 sires and 27236 dams. These data were collected from 110 herds during 2011 to 2015 by the Iranian Animal Breeding Center. For all lactations, birth year, birth month, calving year, calving season, calving month, age and herd ...

Journal: :Sustainable Agriculture Research 2021

The objective of the present work was to analyze evolution productive indicators over time in Nelore cows Bolivian tropics. period between 1991 and 2016, corresponding 3899 calvings were used for research which belong Technology Center on Agriculture Livestock Bolivia belonging (FUNDATION CETABOL) Cooperativa Agropecuaria Integral San Juan de Yapacan&amp;iacute; used. Cows ordered by birth into...

2011
Francesca MALCHIODI Mauro PENASA Francesco TIEZZI Giovanni BITTANTE

Pure Holstein (HO, n=430), crosses between Swedish Red and HO (SRxHO, n=41), Montbeliarde and HO (MOxHO, n=18), and MO and SRxHO (MOxSH, n=53) were compared for milk, fat and protein yield, fat and protein percentage, somatic cell count (SCC), milking time (MT), and age at fi rst and second calving. A total of 180,933 test-day information for milk yield and MT, and 5,249 for fat and protein per...

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