Influence of the urea concentration in plasma on pregnancy and dairy components for tropical conditions

Article Sidebar

PDF
Published: Mar 1, 2010

Main Article Content

Roberto Garc?a L?pez
Yaimara Bacallao

Abstract

Information was considered referring to the urea concentration in serum from 160 commercial Holstein dairy cows with average weight of 452 kg, milk yields between 9 and 13.5 L/cow/d, and feeding based on pastures and supplementation, with levels between 3 and 4.5 kg/a/d. The milk yields managed to surpass 4000 L/lactation, and two groups were formed for the analysis, according to the urea concentrations in plasma: a) animals with urea values higher than 20 mg %, and b) animals with values lower than 20 mg %. Finally, 66 cows with levels higher than 20 mg % and 94 with lower levels were grouped. For the selection, it was started from the criterion that the indicator urea in plasma was determined in the same dairy unit. Also, the percentage of pregnancy at first service and the results of both groups in respect to the milk composition (fat, protein, non-fatty solids, total solids, and protein-fat ratio) were assessed. The values of productive efficiency at first service, as well as those of the milk components, indicated that concentrations in plasma higher than 20 mg % of urea in blood may provoke upsets in the animal response and affect basic indicators. It is suggested that, for the Cuban conditions, the urea determination in blood should be a habitual search in dairy herds due to the referential value provided by this indicator.
Key words: dairy herds, urea in blood, milk components.

Article Details

How to Cite
Garc?a L?pez, R., & Bacallao, Y. (2010). Influence of the urea concentration in plasma on pregnancy and dairy components for tropical conditions. Cuban Journal of Agricultural Science, 44(1). Retrieved from https://cjascience.com/index.php/CJAS/article/view/285
Issue
Vol. 44 No. 1 (2010): Cuban Journal of Agricultural Science
Section
Animal Science

Those authors that have publications with this journal accept the following terms:

1. They will retain their copyright and guarantee the journal the right of first publication of their work, which will be simultaneously subject to the License Creative Commons Attribution-NonCommercial 4.0 International (CC BY-NC 4.0) that allows third parties to share the work whenever its author is indicated and its first publication this journal. Under this license the author will be free of:

  • Share — copy and redistribute the material in any medium or format
  • Adapt — remix, transform, and build upon the material
  • The licensor cannot revoke these freedoms as long as you follow the license terms.

Under the following terms:

  • Attribution — You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use.
  • NonCommercial — You may not use the material for commercial purposes.
  • No additional restrictions — You may not apply legal terms or technological measures that legally restrict others from doing anything the license permits.

2. The authors may adopt other non-exclusive license agreements to distribute the published version of the work (e.g., deposit it in an institutional telematics file or publish it in a monographic volume) whenever the initial publication is indicated in this journal.

3. The authors are allowed and recommended disseminating their work through the Internet (e.g. in institutional telematics archives or on their website) before and during the submission process, which can produce interesting exchanges and increase the citations of the published work. (See the Effect of open access).

Author Biographies

Roberto Garc?a L?pez

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, La Habana

Yaimara Bacallao

Instituto de Ciencia Animal, Apartado Postal 24, San Jos? de las Lajas, La Habana