年齡與季節對阿爾拜因與努比亞公山羊精液品質之影響

本試驗之目的在於瞭解阿爾拜因與努比亞公山羊，隨年齡增長與台灣當地季節變化對其精液品質之影響，並以精子分析儀進行精液性狀的評估，建立客觀及準確公山羊生殖性能之基礎資料，作為未來公山羊生殖管理與冷凍精液製作之參考。自1998年9月至2000年12月間，調查6月齡（時序為9月）至33月齡之阿爾拜因與努比亞公山羊之精液品質隨年齡與季節變化之影響，調查結果如下：（1）精子濃度：阿爾拜因與努比亞公山羊在性成熟初始適逢繁殖季節開始，隨著年齡增長與繁殖季節之效應，精子濃度逐步增加，然性成熟之後，精子濃度受繁殖季節效應之影響不若性成熟初始之明顯。（2）精子存活率：阿爾拜因之精子存活率在性成熟初始或是性成熟之後，均顯著受到季節變化之影響。努比亞在性成熟初始，精子存活率時而高時而低，不易觀察到年齡與季節變化的影響，性成熟後則亦受到季節變化之影響。（3）精子活力指數：阿爾拜因與努比亞公山羊之精子活力指數均隨著季節效應而呈現顯著性的週期變化。（4）精子畸型率：阿爾拜因與努比亞之精子畸型率在性成熟初始變化較為顯著，然隨著年齡增長，精子畸型率則維持在2%～4%，受年齡與季節變化之影響則不大。（5）射精量：阿爾拜因與努比亞之精液體積在繁殖季節時增加而在非繁殖季節時減少，顯示精液體積之變化深受季節效應之影響。（6）睪丸週長：阿爾拜因與努比亞睪丸週長在性成熟初始階段均無顯著增加，然而隨著年齡增長，睪丸週長便逐步穩定的增加，且不因繁殖季節與否而有所消長。綜合上述之調查結果，在台灣的飼養環境下，阿爾拜因與努比亞公山羊之精液性狀仍受到繁殖季節與非繁殖季節變化的影響。

關鍵字

年齡；季節；精液品質；公山羊

並列摘要

The purpose of this study was to evaluate the effects of age and seasonal change on the semen quality in Alpine and Nubian bucks to establish the objective and exact basal reproductive performance characteristics. This study was conducted to determine the effects of age and seasonal change on the semen quality in Alpine and Nubian bucks from 6 months of age (Sep. 1998) to 33 months of age (Dec. 2000). The results are as follows: (1) semen concentration: the semen concentration of Alpine and Nubian was influenced by age and seasonal change at the beginning of puberty. However, after puberty, the breeding season effect on the semen concentration was not significant. (2) sperm viability: the sperm viability of the Alpine was deeply influenced by seasonal changes whether at the beginning of puberty or complete puberty. In the Nubian, age and seasonal changes on sperm viability at the beginning of puberty were not observed. However, after puberty, seasonal changes affects were observed. (3) sperm motility: the sperm motility presented significant seasonal effects in both the Alpine and Nubian. (4) sperm malformation rate: the sperm malformation rate in Alpine and Nubian varied significantly at the beginning of puberty. The sperm malformation rate maintained at 2%~4% when the age increased. Age and seasonal changes influences were not significant. (5) ejaculation volume: the ejaculation volume of Alpine and Nubian bucks increased during the breeding season and declined during the non-breeding season. (6) scrotal circumference: the scrotal circumference did not increase significantly at the beginning of puberty in both the Alpine and Nubian. However, the scrotal circumference increased gradually with maturity. It did not increase or decline related to the breeding season. This indicated that the ejaculation volume was deeply influenced by seasonal effects. In conclusion, breeding season and out of breeding season still influenced the semen quality of Alpine and Nubian bucks under feeding environment in Taiwan.

並列關鍵字

Age ； Season ； Semen quality ； Bucks

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