| Autor: |
Ayyat MS; Department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, Egypt., Al-Sagheer A; Department of Animal Production, Faculty of Agriculture, Zagazig University, Zagazig, Egypt., Noreldin AE; Department of Histology and Cytology, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt., Abd El-Hack ME; Department of Poultry, Faculty of Agriculture, Zagazig University, Zagazig, Egypt., Khafaga AF; Department of Pathology, Faculty of Veterinary Medicine, Alexandria University, Edfina, Egypt., Abdel-Latif MA; Department of Nutrition and Veterinary Clinical Nutrition, Faculty of Veterinary Medicine, Damanhour University, Damanhour, Egypt., Swelum AA; Department of Animal Production, College of Food and Agriculture Sciences, King Saud University, Riyadh, Saudi Arabia.; Department of Theriogenology, Faculty of Veterinary Medicine, Zagazig University, Zagazig, Egypt., Arif M; Department of Animal Sciences, University College of Agriculture, University of Sargodha, Sargodha, Pakistan., Salem AZM; Facultad de Medicina Veterinaria y Zootecnia, Universidad Autónoma del Estado de México, Toluca, México. |
| Abstrakt: |
Providing essential amounts of balanced nutrients is one of the most vital aspects of livestock production. Among nutrients, protein has an essential role in many physiological functions of animals. Amino acids in needs for both high and medium yielding ruminant animals are not fully covered by microbial degraded feed sources in the rumen of animals, and they must be met by protecting the proteins from being broken down in the rumen; hence, the dietary supplementation of rumen-protected proteins (RPP), including mainly rumen-protected methionine (RPM), became imperative. Many researchers are interested in studying the role of (RPM) in ruminant animals concerning its effect on milk yield, growth performance, digestibility, dry matter intake and nitrogen utilization efficiency. Unfortunately, results obtained from several investigations regarding RPM indicated great fluctuation between its useful and useless effects in ruminant nutrition particularly during early and late lactation period; therefore, this review article may be helpful for ruminant farm owners when they decide to supplement RPM in animal's diet. Conclusively, supplementation of RPM often has a balanced positive influence, without any reported negative impact on milk yield, growth performance and blood parameters especially in early lactating ruminant animals and when used with the low crude protein diet. |
