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Effects of zinc source and dietary concentration on serum zinc concentrations, growth performance, wool and reproductive characteristics in developing rams.
Animal ( IF 3.7 ) Pub Date : 2019-10-07 , DOI: 10.1017/s1751731119002180
C M Page 1 , M L Van Emon 1 , T W Murphy 1 , C K Larson 2 , J G Berardinelli 1 , I R McGregor 1 , J B Taylor 3 , W C Stewart 1
Affiliation  

Dietary Zn has significant impacts on the growth and development of breeding rams. The objectives of this study were to evaluate the effects of dietary Zn source and concentration on serum Zn concentration, growth performance, wool traits and reproductive performance in rams. Forty-four Targhee rams (14 months; 68 ± 18 kg BW) were used in an 84-day completely randomized design and were fed one of three pelleted dietary treatments: (1) a control without fortified Zn (CON; n = 15; ~1 × NRC); (2) a diet fortified with a Zn amino acid complex (ZnAA; n = 14; ~2 × NRC) and (3) a diet fortified with ZnSO4 (ZnSO4; n = 15; ~2 × NRC). Growth and wool characteristics measured throughout the course of the study were BW, average daily gain (ADG), dry matter intake (DMI), feed efficiency (G : F), longissimus dorsi muscle depth (LMD), back fat (BF), wool staple length (SL) and average fibre diameter (AFD). Blood was collected from each ram at four time periods to quantify serum Zn and testosterone concentrations. Semen was collected 1 to 2 days after the trial was completed. There were no differences in BW (P = 0.45), DMI (P = 0.18), LMD (P = 0.48), BF (P = 0.47) and AFD (P = 0.9) among treatment groups. ZnSO4 had greater (P ≤ 0.03) serum Zn concentrations compared with ZnAA and CON treatments. Rams consuming ZnAA had greater (P ≤ 0.03) ADG than ZnSO4 and CON. There tended to be differences among groups for G : F (P = 0.06), with ZnAA being numerically greater than ZnSO4 and CON. Wool staple length regrowth was greater (P < 0.001) in ZnSO4 and tended to be longer (P = 0.06) in ZnAA treatment group compared with CON. No differences were observed among treatments in scrotal circumference, testosterone, spermatozoa concentration within ram semen, % motility, % live sperm and % sperm abnormalities (P ≥ 0.23). Results indicated beneficial effects of feeding increased Zn concentrations to developing Targhee rams, although Zn source elicited differential responses in performance characteristics measured.

中文翻译:

锌源和日粮浓度对发育中公羊血清锌浓度、生长性能、羊毛和繁殖特性的影响。

日粮锌对种羊的生长发育有显着影响。本研究的目的是评估日粮锌源和浓度对公羊血清锌浓度、生长性能、羊毛性状和繁殖性能的影响。44 只 Targhee 公羊(14 个月;68 ± 18 kg BW)用于 84 天完全随机设计,并饲喂三种颗粒饲料处理中的一种:(1)没有强化锌的对照(CON;n = 15; ~1 × NRC); (2) 强化锌氨基酸复合物 (ZnAA; n = 14; ~2 × NRC) 和 (3) 强化 ZnSO4 (ZnSO4; n = 15; ~2 × NRC) 的饮食。在整个研究过程中测量的生长和羊毛特征是体重、平均日增重 (ADG)、干物质摄入量 (DMI)、饲料效率 (G: F)、背最长肌深度 (LMD)、背膘 (BF)、羊毛短纤维长度(SL)和平均纤维直径(AFD)。在四个时间段从每只公羊收集血液以量化血清锌和睾酮浓度。试验完成后 1 至 2 天收集精液。治疗组的 BW (P = 0.45)、DMI (P = 0.18)、LMD (P = 0.48)、BF (P = 0.47) 和 AFD (P = 0.9) 没有差异。与 ZnAA 和 CON 处理相比,ZnSO4 的血清 Zn 浓度更高(P ≤ 0.03)。消耗 ZnAA 的公羊比 ZnSO4 和 CON 具有更高的 (P ≤ 0.03) ADG。G : F (P = 0.06) 的组间往往存在差异,其中 ZnAA 在数值上大于 ZnSO4 和 CON。与 CON 相比,ZnSO4 处理组的羊毛短纤维长度再生更大(P < 0.001),而 ZnAA 处理组的羊毛短纤维长度再生更长(P = 0.06)。在阴囊周长的治疗中没有观察到差异,睾酮、公羊精液中的精子浓度、活力百分比、活精子百分比和精子异常百分比 (P ≥ 0.23)。结果表明,增加锌浓度对发育中的 Targhee 公羊的有益影响,尽管锌源在测量的性能特征中引起了不同的反应。
更新日期:2019-11-01
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