Abstract
Background: The current study aimed to determine the most strongly correlated variable of pelvimetry with the parity in our native breed Egyptian buffaloes.
 Methods: The study was conducted on 36 female buffaloes (nullipara, n=14, primipara n=6 and pluripara, n=16 with 2-4 births) aged between <15 months, n=15 and 65 months, n=21. The internal and external pelvic measurements were obtained using the rice pelvimeter and Freeman’s measuring tape.
 Results: Strong positive linear relationships were found for the distance between ischiatic tuberosities and the distance between sacral tubercles with the correlation coefficients of 0.64 and 0.62, respectively. The conjugate diameter increased progressively with the age and number of births, with a correlation coefficient of 0.96. The pelvic area had a very strong positive linear relationship with a correlation coefficient of 0.89. The linear combination of the predictor variable (conjugate diameter), to predict the number of birth was developed successfully.
 Conclusion: The strong relationship between the conjugate diameter and the number of births could be employed to predict the dystocia and estimate the age of female buffalo. Furthermore, these findings could be aid paleontologists in studying buffalo fossils.
Highlights
Buffalo (Bubalus bubalis) plays a prominent role in rural livestock production in Egypt
Studies were shown that the internal pelvic area is one of the best predictions of dystocia in heifers and the best method of dealing with calving problems is to avoid them [3]
Spearman rank correlation was used to test for correlation between the number of birth and each of the ten predictor variables
Summary
Buffalo (Bubalus bubalis) plays a prominent role in rural livestock production in Egypt. The incidence of dystocia, difficult parturition is higher than in cows [1]. Calving ease may be influenced by the level of development of the pelvic area and reproductive organs, especially in heifers [2]. Studies were shown that the internal pelvic area is one of the best predictions of dystocia in heifers and the best method of dealing with calving problems is to avoid them [3]. Pelvimetry means the measurement of the dimensions and capacity of the pelvis, either externally, internally, or both [4]. Close correlations between calving ease and pelvic measurements and its shape. The current study aimed to determine the most strongly correlated variable of pelvimetry with the parity in our native breed Egyptian buffaloes
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