Factors Affecting Days Open in Dairy Buffalo and Evaluation the Impact of Days Open on the Subsequent Reproductive Traits

Abdelrahman, Hayaa Ahmed; Mohamed, Salah M.; El-Tarabany, Mahmoud S.; Ramadan, Sherif I.; Shafik, Basant M.

doi:10.21608/ejvs.2024.267820.1836

	Factors Affecting Days Open in Dairy Buffalo and Evaluation the Impact of Days Open on the Subsequent Reproductive Traits
Egyptian Journal of Veterinary Sciences
Article 5, Volume 56, Issue 9, September 2025, Page 2031-2037 PDF (686.67 K)
Document Type: Original Article
DOI: 10.21608/ejvs.2024.267820.1836
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Authors
Hayaa Ahmed Abdelrahman ¹; Salah M. Mohamed²; Mahmoud S. El-Tarabany³; Sherif I. Ramadan¹; Basant M. Shafik¹
¹Animal Wealth Development Department, Faculty of Veterinary Medicine, Benha University, Moshtohor, Toukh, Qalyubia, Egypt
²Department of Applied Statistics and Econometrics,Faculty of Graduate Studies for Statistical Research, Cairo University.
³Department of Animal Wealth Development, Faculty of Veterinary Medicine, Zagazig University, Sharkia, Egypt
Abstract
Days open (DO) is considered one of the most important parameters used to determine the reproductive performance of dairy buffalo farms. It is known as the duration between calving and the next pregnancy, minimizing this period helps control the calving interval and thus the reproductive efficiency of the buffalo farms. So, the aim of this study was to apply the Poisson regression model to determine factors influencing days open (DO) in dairy buffalo farms, by evaluating several parameters such as calving seasons, parity, 305- day milk production, lactation length, Age at first calving (AFC), age at first service (AFS), calving interval (CI), and evaluating how days open affect the subsequent reproductive indices. A total of 1388 buffaloes were collected from reliable records of large dairy buffalo farms. These buffaloes calved during the period extending from 2003 to 2015. The results of this study revealed that the important factors for DO were uniparous parity (P=0.03), calving seasons, calving interval, age at first calving, 305-day milk yield and lactation length (P ≤ 0.001). The reproductive measurements of CI, AFC, and N/C showed significant difference at the level of days open groups (P ≤ 0.001). Subsequently; they considered good indicators for evaluating fertility in dairy buffalo farms.
Keywords
Days open; Reproductive indices; Egyptian buffaloes; Poisson regression


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