کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
2456862 1554362 2015 4 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Characterization of the productive performance of Highlander sheep in Southern Chile. II. Male reproductive traits
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک علوم دامی و جانورشناسی
پیش نمایش صفحه اول مقاله
Characterization of the productive performance of Highlander sheep in Southern Chile. II. Male reproductive traits
چکیده انگلیسی


• We assess the reproductive performance of Highlander rams in vitro and in vivo.
• Highlander rams exhibited average performance at BSE clinical assessment.
• Compared to Suffolk, spermatozoa have lower velocity traits and bigger linearity.
• Compared to Suffolk rams, Highlander displayed lower sexual activity.
• Reproductive performance at the field can meet standards for high productivity.

Basic information on the reproductive potential of animals is required to establish sound reproductive procedures including the application of assisted reproductive technology. The study aimed to characterize the reproductive performance of rams of the Highlander breed during the breeding season. With this purpose 53 rams were allocated to two experiments: in the first one, 8 Highlander rams were compared against 8 Suffolk rams used as reference in terms of scrotal circumference, ejaculate traits and service capacity test; and in the second experiment, 37 rams and 506 ewes in a male to female ratio ranging between 1:8–24, were used to assess male fertility in terms of conception and prolificacy rates of ewes exposed. Compared to Suffolk rams, results showed that Highlander rams exhibited larger scrotal circumference (P = 0.003), tended to have both larger sperm concentration (P = 0.08) and lower volume (P = 0.098), and have similar sperm normal morphology (P = 0.63) in their ejaculates; their spermatozoa moved at lower speed (VCL, P < 0.001; VAP, P = 0.02) but more linearly (LIN, P = 0.006; ALH, P < 0.001), and rams displayed less sexual activity (effective mounts, P = 0.028; false mounts, P < 0.001). When rams were exposed for natural breeding, their average reproductive performance was consistent with the conventional targets demanded for high productivity. Although significant differences in performances were found between rams, no correlation was found between conception rate neither with male to female ratio (P = 0.82) nor with prolificacy (P = 0.95) or between male to female ratio and prolificacy (P = 0.58). Cumulative results suggest that Highlander rams exhibit an adequate potential for reproduction. However, for meeting high standards of productivity, Highlander rams need to be selected by potential fertility of their ejaculates and service capacity in addition to the conventional breeding soundness evaluation.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Small Ruminant Research - Volume 130, September 2015, Pages 189–192
نویسندگان
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