Analysis of age factors affecting the branching velvet and weight of ant-lers in Père David's deer(Elaphurus davidianus)
Père David's deer(Elaphurus davidianus)is originally deer species native distributed in the plains and wet-lands of China.Characterized by cylindrical antlers with a main branch in front and auxiliary branches behind,they shed their antlers after the winter solstice.In Père David's deer,the relationship between external parameters and the weight of the antlers varies significantly for Père David's deer.In this study,we conducted a comprehensive analysis by track-ing and recording the dates of antler branching,the number of branches,and the weight of antlers from 2019 to 2023.Additionally,we utilized an infrared rangefinder to measure the length,diameter,and total length of antler branches across different age groups.In 2022,we further measured the parameters of shed antlers'cross-sections using a caliper and employed qRT-PCR to determine changes in the content of related molecules in the velvet tissue of different age groups.Subsequently,we conducted a correlation analysis of antler branching and weight parameters with age.The re-sults showed that with each additional year of age,the antlers exhibited an increase of one branch.Between the ages of 3 and 7,the weight of antlers demonstrated the following progression:1 223 g,872 g,884 g,899 g,and 699 g,respective-ly.Furthermore,for every additional centimeter of antler stem diameter,the weight of antler increases of 535 g,531 g,613 g,681 g,and 721 g,respectively.The content of vascular endothelial growth factor(VEGF)also exhibited an age-re-lated increase(P=0.0007,n=18).Under consistent age conditions,the escalation in antler weight displayed the stron-gest correlation with the number of antler branches(r=0.8274,P=0.0054),antler diameter(r=0.8364,P=0.0007),and antler total length(r=0.7971,P=0.0073).Moreover,the weight of the antler cross-section positively correlated with outer diameter length(r=0.9470,P=0.0066),outer diameter width(r=0.9246,P=0.0018),and outer diameter length-width ratio(r=0.9217,P=0.0027).The rise in velvet weight exhibited positive correlations with the daily growth length,dry total length,and main stem circumference of velvet.However,from 20 to 60 days post-regeneration,the content of VEGF demonstrated a subsequent decrease accordingly.Nonetheless,these findings offer valuable in-sights into understanding the relationship between the number of antler branches and vascular endothelial regeneration factors,as well as screening molecular mechanisms associated with deer velvet production.Furthermore,they serve as a foundation for enhancing deer velvet production,breeding practices,and the scientific conservation of deer species.
Père David's deerAgeBranch numberVascular endothelial growth factor(VEGF)Antler yield
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