Agricultural Science 2021-11-01T18:23:24+08:00 Eric Johnson Open Journal Systems <p><em>Agricultural Science</em>&nbsp;(ISSN 2690-5396 e-ISSN 2690-4799) is an international, double-blind peer-reviewed, open-access journal, published by the IDEAS SPREAD&nbsp;in United States. It publishes original research, applied, and educational articles in all areas of agricultural science.&nbsp;Agricultural Science (AS) is quarterly, published in March, June, September and December.<br> <em>Agricultural Science</em> is striving to provide the best platform for researchers and scholars worldwide to exchange their latest findings. Authors are encouraged to submit complete, unpublished, original works that are not under review in any other journals. The journal is published in both print and online versions, and the online version is available for free.</p> The Association of Calcium Profiles at Calving with Health and Performance of Holstein Cows and Their Calves 2021-11-01T18:23:24+08:00 Constantin Gavan Mihaela Riza <p>The aim of this study was to assess the association of hypocalcemia at calving with health and performance of Holstein cows and their calves. Data were collected January 1<sup>st</sup> 2017 to December 31<sup>st</sup> 2020. A total of 431 lactating Holstein Friesian cows (118 primiparous and 313 multiparous) from a research of hypocalcemia was 2 groups (hypo and non-hypo). The overall prevalence of hypocalcemia was 3.4% for first-lactation cows and 18% for multiparous cows. Lactating dairy cows with hypocalcemia had greater proportion of cows with Retained Fetal Membranes (RFM) metritis and culling within 60 days in milk (DIM), compared with non-hypocalcemia respectively. For the first 2 official milk tests milk yield and components (% fat, % protein on SCC) did not differ between hypo and non-hypo cows. The days in milk at first service, mastitis, dystocia and pregnancy at first service were not different between hypo and non-hypo groups. The proportion of stillbirth, survival at 60 days of age in calves did not differ between calves born from hypo or non-hypo cows. Calves born from Hypo cows had greater incidence of diarrhea (38.3%) than calves born (22.3%) from non-hypo cows. The results of this study show that hypocalcemia in calving has significant health implications for both dams and their calves.</p> <p>&nbsp;</p> 2021-11-01T00:00:00+08:00 ##submission.copyrightStatement##