The aim of this work was to analyse the genetic parameters affecting days open (DO) in beef cattle to evaluate its potential as criterion of selection. The present study characterises DO as a trait with considerable genetic variability, relative to that usually found for reproduction traits, especially for heifers and second calving cows. The estimates of heritability for the trait ranged from ...

Data on 393 002 parturitions and performance in the following production cycle were collected from the SYMLEK database for 145 457 Polish Holstein-Friesian cows representing the active population in the Pomorze and Kujawy regions. The animals first calved during 2000–2012 and were used or culled by the end of 2013. GLM and FREQ procedures of the SAS package were used for the statistical calcula...

This study was conducted to demonstrate some hematological and blood biochemical profile of Iraqi riverine buffaloes (Bubalus bubalis) around calving and two months postpartum (PP) period. Ten out of 22 adult buffaloes of 4.6±0.97 years old were used in this study. Blood samples was collected from each buffalo around calving and 15 days interval during two months PP. The PCV and Hb as hematolog...

Inbreeding coefficients of 30,794 registered Ayrshire cows were calculated from relationships between sire and maternal male ancestors. Average inbreeding coefficient of all cows was less than 1% and of the 5,202 inbred cows was 5.4%. Fewer than 2% of inbred cows had coefficients greater than 15%. Percent of inbred cows increased from 23% of cows born in 1972 to 43% in 1980. Over the same perio...

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Penelitian ini bertujuan untuk mengetahui kinerja reproduksi induk sapi sumba ongole di kecamatan kambera, kabupaten timur karena hal sangat menentukan peningkatan populasi ternak dan ketersedian daging. dilakukan dengan metode survei pada peternak ongole, 41 ekor kelurahan lambanapu mulai dari bulan maret-april 2022. Parameter penelitian adalah umur ternak, calving interval, post partum estrus...

Brahman cows were used to evaluate the effects of postpartum nutrition and suckling on reproductive and calf performance. Cows received high or low TDN and once-daily or unrestricted suckling. High TDN (H; 111% of NRC recommendation) cows received a 75% corn: 25% soybean meal diet. Low TDN (L; 93% of NRC recommendation) cows received no concentrates. Once-daily suckled (restricted, R) cows nurs...