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1.
《动物营养学报》2021,33(8)
本试验旨在研究饲喂模式对蒙贝利亚×荷斯坦杂交犊牛(以下简称蒙荷杂交犊牛)生长性能、体尺指标及血清学指标的影响。选取30头蒙荷杂交犊牛,按出生日期、初生重分为3组,即颗粒化开食料组(CON组)、口感化开食料组(Te组)和颗粒化开食料加苜蓿干草组(PeA组),每组10头牛。CON组犊牛3日龄开始饲喂颗粒化开食料;Te组犊牛3日龄开始饲喂口感化开食料;PeA组犊牛3日龄开始饲喂颗粒化开食料,并在15日龄开始饲喂苜蓿干草。试验期10周。所有犊牛第8周断奶,试验期内每周跟踪记录犊牛的采食量、体重、体尺指标,并测定血清学指标。结果表明:1)饲喂模式对断奶后犊牛的开食料采食量的影响呈差异趋势(P=0.068),以Te组最高,PeA组次之,CON组最低。2)饲喂模式对断奶前后犊牛的体重和平均日增重无显著影响(P0.05)。3)饲喂模式对断奶后犊牛的体长指数有显著影响(P0.05),Te组体长指数显著高于CON组和PeA组(P0.05)。饲喂模式对断奶前后犊牛的体躯指数和管围指数无显著影响(P0.05)。4)饲喂模式对断奶前后犊牛的血清学指标无显著影响(P0.05)。由此可见,在本试验3种饲喂模式下,断奶前蒙荷杂交犊牛生长性能、体尺指标及血清学指标无显著差异;断奶后蒙荷杂交犊牛体长指数呈显著差异,开食料采食量呈差异趋势,但其他指标无显著差异。 相似文献
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本试验旨在研究不同饲喂方式对断奶前犊牛生长性能的影响。试验选择46头体重和出生日期相近的犊牛,随机分成两组,每组23头。其中,Ⅰ组采用传统饲喂模式(粉状开食料+干草+牛奶),从4日龄开始补充粉状开食料,10日龄开始补充苜蓿干草和精饲料,干草自由采食;Ⅱ组采用现代饲喂模式(颗粒型开食料+牛奶),从4日龄开始补充颗料型开食料。两组均60日龄断奶。结果表明,Ⅰ组犊牛日均干物质采食量显著高于Ⅱ组(P<0.05),但两组的平均日增重、体高、体斜长、胸围、前管围均无显著差异(P>0.05);血清中葡萄糖(GLU)、甘油三酯(TG)水平组间无差异(P>0.05),45d、60dⅡ组总蛋白(TP)浓度显著高于Ⅰ组(P<0.05),45dⅠ组尿素氮(BUN)显著高于Ⅱ组(P<0.05);Ⅱ组CP、EE和P的表观消化率显著高于Ⅰ组(P<0.05);Ⅱ组犊牛腹泻率(2.39%)低于Ⅰ组(3.12%)。试验表明,断奶前饲喂颗粒开食料有利于降低犊牛腹泻的发生率,提高犊牛对固体饲料的适应性。 相似文献
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营养条件对荷斯坦公犊生长发育及血液中激素水平的影响 总被引：1，自引：0，他引：1
选择同期出生的48头中国荷斯坦公犊,在其1月龄时随机分为4组,Ⅰ、Ⅱ、Ⅲ、Ⅳ组分别采用全乳、全乳+精料、代乳粉(料)和精料(对照组)进行饲养,研究不同日粮饲喂犊牛对其生长发育的影响。结果表明:Ⅰ组的体重在2～6月龄时均显著高于Ⅲ、Ⅳ组(P<0.05);尽管Ⅲ组的体重和日增重在2月龄时显著低于另3组(P<0.05),但到6月龄时,其日增重达到1.35kg/d,且与Ⅰ组无显著差异(P>0.05)并明显高于Ⅳ组(P<0.05)。说明代乳料饲喂的犊牛在后期的生长能够接近全乳饲喂的水平。4组间体长指数和髋胸指数在分组饲养后的开始几个月里存在显著性差异(P<0.05)。体重、日增重以及多数体尺指标均与T3和GH浓度呈显著(P<0.05)或极显著(P<0.01)相关,T4和INS浓度仅与体斜长、体长指数和髋胸指数呈显著(P<0.05)相关,且日增重仅与T3浓度有极显著相关(P<0.01)。Ⅰ组犊牛的血清中T3浓度在2～6月龄时均显著高于Ⅳ组(P<0.05),且除6月龄以外,其余各月龄时均显著高于Ⅲ组(P<0.05)。说明血清中T3浓度可能是能反映并监控荷斯坦犊牛生长发育和营养情况的重要指标。 相似文献
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代乳粉对早期断奶犊牛生长的影响 《畜牧与饲料科学》2016,37(4):27-27
旨在评价饲喂代乳粉对早期断奶犊牛生长及培育成本的影响。选取体重相近的新生犊牛45头,随机分为试验1组、试验2组和对照组;试验1组饲喂A品牌代乳粉,试验2组饲喂B品牌代乳粉,对照组饲喂牛场产鲜牛奶;测定各组实验犊牛的出生体重、1月龄体重和50日龄断奶体重;计算并比较各组犊牛培育成本。结果表明,各组犊牛的出生体重和1日龄体重差异不显著（P〉0.05）;试验1组和试验2组犊牛的50日龄断奶体重分别比对照组增加5.12、2.86 kg,且试验1组与对照组相比差异显著（P〈0.05）;试验1组和试验2组犊牛的平均日增重分别比对照组增加0.14、0.07 kg,且试验1组和对照组相比差异显著（P〈0.05）;试验1组与试验2组平均每头犊牛分别比对照组节约饲养成本198.8、222.0元。综上提示,使用代乳粉能够促进犊牛生长,降低犊牛的培育成本,提高养殖场的经济效益。 相似文献
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为研究不同日粮配方对断奶犊牛生长发育的影响,试验采用随机区组设计,选择3～4月龄西杂公牛40头,随机分为Ⅰ、Ⅱ、Ⅲ、Ⅳ组。以白豌豆、豆粕、棉粕、胡麻饼等为原料设计8组(A_1、A_2,B_1、B2,C_1、C2,D_1、D_2)日粮配方,对犊牛进行180 d饲喂试验。试验分两个阶段进行,第1阶段(犊牛体重100～200 kg)Ⅰ、Ⅱ、Ⅲ、Ⅳ组牛分别饲喂A_1、B_1、C_1、D_1配方日粮,第2阶段(犊牛体重201～300 kg)Ⅰ、Ⅱ、Ⅲ、Ⅳ组牛分别饲喂A_2、B_2、C_2、D_2配方日粮。结果表明:100～200 kg阶段,Ⅱ组犊牛平均日增重分别较Ⅰ、Ⅲ、Ⅳ组多增重32.22 g、26.67 g、56.67 g,Ⅱ组头均日增重效益分别较Ⅰ、Ⅲ、Ⅳ组提高6.47%、6.74%、15.59%,4组犊牛在体尺发育方面差异不明显(P>0.05);201～300 kg阶段,Ⅳ组犊牛平均日增重分别较Ⅰ、Ⅱ、Ⅲ组高261.09 g(P<0.05)、225.53 g(P>0.05)、197.80 g(P>0.05),Ⅳ组犊牛头均日增重效益分别较Ⅰ、Ⅱ、Ⅲ组高7.41元(P<0.05)、6.65元(P>0.05)、5.58元(P>0.05),Ⅳ组犊牛的体尺指数较其他组高。说明按照犊牛在100～200 kg生长阶段营养需要配制的玉米+小麦麸+豆粕+粗饲料型日粮(B1配方)、201～300 kg生长阶段配制的玉米+小麦麸+胡麻饼+粗饲料型日粮(D2配方)饲喂犊牛可降低饲养成本,提高饲料报酬和日增重,增加经济效益。 相似文献
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本试验将16头荷斯坦公犊牛随机分为两组:试验组饲喂添加苜蓿叶粉和膨化玉米的一号开食料和二号断奶过渡料,对照组饲喂未添加苜蓿叶粉和膨化玉米的三号开食料。60日龄时对犊牛生长性能进行测定分析,每组屠宰3头犊牛,测定瘤网胃重及容积、瘤胃乳头高度及宽度,结果显示:试验组的瘤网胃重及容积、瘤胃乳头及宽度高于对照组,差异显著(P<0.05);试验组犊牛日增重和体尺与对照组相比差异不显著(P>0.05)。提示在7~40日龄饲喂一号开食料、41~60日龄饲喂二号断奶过渡料在一定程度上促进了犊牛瘤胃组织的发育。 相似文献
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本试验旨在研究全混合日粮(TMR)中相同中性洗涤纤维(NDF)水平下,以竹叶或茶叶渣替代苜蓿对断奶犊牛生长性能、消化代谢及血清抗氧化和免疫指标的影响。按照随机区组设计将45头105日龄的荷斯坦公犊牛分成3组,每组15头犊牛,分别饲喂苜蓿(AH组)、竹叶(BL组)或茶叶渣(TR组)为主要NDF来源的TMR。预试期15 d,正试期60 d。结果表明:1)180日龄时,TR组的体重显著低于AH组(P<0.05);试验期间,BL组与AH组之间的平均日增重、干物质采食量和料重比无显著差异(P>0.05)。2)与AH组相比,BL组的干物质(DM)和酸性洗涤纤维(ADF)表观消化率显著降低(P<0.05),而有机物(OM)和NDF表观消化率差异不显著(P>0.05);TR组的NDF表观消化率显著提高(P<0.05),而DM、OM和ADF表观消化率差异不显著(P>0.05)。3)与AH组相比,BL组的尿能、总能消化率、总能代谢率和消化能代谢率显著降低(P<0.05)。4)与AH组相比,BL组的尿氮显著提高(P<0.05),氮沉积率显著降低(P<0.05);TR组的粪氮显著提高(P<0.05),氮表观消化率显著降低(P<0.05)。5)与AH组相比,BL和TR组的血清谷胱甘肽过氧化物酶(GSH⁃Px)和过氧化氢酶(CAT)活性显著降低(P<0.05),血清免疫球蛋白A(IgA)、丙二醛(MDA)含量显著升高(P<0.05);BL组的血清总抗氧化能力(T⁃AOC)显著降低(P<0.05)。由此可见,与饲喂苜蓿饲粮相比,饲喂竹叶饲粮的断奶犊牛生长性能及OM、NDF表观消化率相近,但能量和氮的利用率降低;饲喂茶叶渣饲粮的断奶犊牛能量利用率相近,而NDF表观消化率显著提高,生长性能和氮的利用率降低;饲喂竹叶饲粮和茶叶渣饲粮的断奶犊牛血清IgA含量显著提高,抗氧化能力降低。综上所述,断奶犊牛阶段可以用竹叶(24.38%)替代苜蓿作为饲粮的粗饲料。 相似文献
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赵凤至杨海明胥蕾万晓莉王志跃 《动物营养学报》2018,(7):2717-2724
本试验旨在研究饲粮中果胶对28~70日龄扬州鹅生长性能、体尺性状、屠宰性能及脏器指数的影响。选用180只体重相近、健康的28日龄扬州鹅公鹅,随机分为3个组,每组6个重复,每个重复10只鹅。试验Ⅰ组(对照组)饲喂基础饲粮,试验Ⅱ、Ⅲ组分别饲喂添加1.5%和3.0%果胶的试验饲粮。试验期为42 d。结果表明:1)与对照组相比,饲粮中添加1.5%和3.0%果胶显著降低了42、56、70日龄扬州鹅体重(P<0.05),显著降低28~70日龄仔鹅的平均日增重(P<0.05),显著提高了28~70日龄仔鹅的料重比(P<0.05)。2)与对照组相比,饲粮中添加3.0%果胶显著降低了70日龄仔鹅的胸深和胸宽(P<0.05)。3)与对照组相比,饲粮中添加1.5%果胶显著降低了70日龄仔鹅的胸肌率(P<0.05),饲粮中添加3.0%果胶显著降低了70日龄仔鹅的胸肌率和腹脂率(P<0.05)。4)与对照组相比,饲粮中添加3.0%果胶显著提高了70日龄仔鹅的脾脏指数和腺胃指数(P<0.05),显著降低了70日龄仔鹅的法氏囊指数和胸腺指数(P<0.05)。由此可知,饲粮中果胶对28~70日龄扬州鹅的生长性能、体尺性状、屠宰性能及脏器指数具有不良影响,这提示在生产实践中,对于一些富含果胶的饲料原料,应当注意其使用量。 相似文献
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本试验旨在通过探索过渡期乳不同饲喂天数及断奶日龄对荷斯坦母犊健康状况和生长性能的影响,以确定最佳的过渡期乳饲喂天数及断奶日龄。试验共选取60头初生荷斯坦母犊,平均分为N(未饲喂过渡期乳组)、L(饲喂3d过渡期乳组)、H(饲喂6d过渡期乳组)三大组,每大组均分为2个小组(N1、N2;L1、L2;H1、H2)。N组第2~15天饲喂常乳;L组第2~4天饲喂过渡期乳,第5~15天饲喂常乳;H组第2~7天饲喂过渡期乳,第8~15天饲喂常乳。N1、L1、H1组均为60日龄断奶,N2、L2、H2组均为75日龄断奶。在试验期间统计分析犊牛的体重、体尺、血液生化指标等。结果表明:(1)与N组相比,H组犊60日龄内腹泻率降低5%,90日龄内体斜长平均增长量显著提高(P0.05),10日龄及90日龄血清中甲状腺素(T4)含量显著上升(P0.05);与L组相比,H组犊牛60、90日龄内的平均日增重及部分体尺的平均增长量均显著提高(P0.05),90日龄血清中T4、白介素-2(IL-2)含量显著上升(P0.05)。(2)75日龄断奶较60日龄断奶更有利于提高犊牛的抗应激能力。故犊牛在哺乳期饲喂6d过渡期乳并于75日龄断奶,能够提高其生长状况和抗应激能力,可为其后期的生长发育和乳用潜能的发挥奠定一定的基础。 相似文献
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深入研究了当归属及其相关7属,古当归属,高山芹属,柳叶芹属,独活属,欧当归属,山芹属及前胡属毛状体和果实结构。结果显示毛状体及果实结构(如:毛状体细胞,翅,油管,维管束,中果皮,内果皮,结合面及结晶)可以用于区分当归属及其相关类群。滇南当归及隆萼当归应从当归属移入独活属,其余当归属物种分为结合面宽及结合面窄两组,前者与前胡属较为相似,但与独活属差别较大,后者与古当归属,高山芹属,柳叶芹属,欧当归属有相似之处。支持分子系统学揭示的当归属不是个自然类群,当归属与前胡属共同位于当归分支,而独活属位于独活分支。山芹属果实结构与其他属不同,翅的中果皮无细胞,且伴生油管位于维管束内侧,为分子系统学显示此属与高山芹属,柳叶芹属,及欧当归属亲缘关系较远提供了形态学依据。 相似文献
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Control of reproduction and of undesirable social and sexual behaviour in dogs and cats 总被引：1，自引：0，他引：1
Delmadinone acetate (DMA)? was tested by oral or parenteral administration to forty female and ten male dogs, and to twenty female and ten male cats for the control of heat and ovulation, and suppression of undesirable sexual and social behaviour. The indications, particulars of medication and the results obtained are shown in the table. The mode of action on the hypothalamus, pituitary and target organs is discussed. Over a thirty-six month trial period DMA proved to be a safe and efficacious drug for the control of sexual and related social functions in female and male pet animals. There were indications that even lower dosages than those employed may prove to be equally effective. Résumé. De l'acétate de delmadinone a été soumis à des tests, par administration buccale ou parentérale, sur quarante chiens femelles et dix chiens mâles et sur vingts chats femelles et dix chats mâles, pour le contrôle du rut et de l'ovulation et pour la suppression de comportement indésirable, sexuel et social. Les indications, les détails de médication et les résultats obtenus sont indiqués à la table. On discute du mode d'action sur Phypothalamus, l'hypophyse et les organes-cibles. Au cours d'une période d'essai de 36 mois, l'acétate de delmadinone s'est révelé une drogue éfficace, sans danger, pour le contrôle des fonctions sexuelles et sociales apparentées, chez les animaux familiers femelles et mâles. Il y avaient certaines indications, que même des doses plus faibles que celles utilisées peuvent se montrer également éffectives. Zusammenfassung. Delmadinonazetat (DMA) wurde durch orale oder parenterale Vera-breichung an vierzig weibliche und zehn männliche Hiade und an zwanzig weibliche und zehn männliche Katzen zur Kontrolle der Hitze und Ovulation, und Suppression von unerwünschtem sexuellem und sozialem Verhalten, gegeben. Die Indikationen, Eigenheiten von Medikation und die erlangten Ergebnisse sind in der Tabelle verzeichnet. Die Art der Wirkung auf den Hypo-thalamus, die Hypophyse und die Erfolgsorgane ist erört. Über eine 36 monatige Versuchsperiode, DMA bewies sich als ein sicheres und wirksames Medikament zur Kontrolle von sexuellen und verbundenen sozialen Funktionen in weiblichen und männlichen Haustieren. Es gab Anzeichen, dass selbst eine niedrigere Dosis als die angewand, sich ebenso wirksam erweisen mag. 相似文献
13.
Ismail Saidi Selemani Lars Olav Eik Øystein Holand Tormod Ådnøy Ephraim Mtengeti Daniel Mushi 《Livestock Science》2013,157(1):173-183
The study was conducted to assess the effects of seasonal variation in the quality and quantity of pasture and management of livestock exclosures (ngitili) on the grazing behavior of cattle and goats. The study was 2×2×2 factorial design with three independent variables: season (Dry or Rainy), ngitili management (Private or Communal) and animal species (Cattle or Goats). Focal and scan observation methods were used to record different behavioral activities. Vegetation attributes from the study areas were measured in two consecutive seasons. Most key forage species had significant higher crude protein (CP) content and in vitro organic matter digestibility (INVOMD) in rainy than in dry season (P<0.05), but Neutral Detergent Fiber (NDF) and Acid Detergent Fiber (ADF) did not vary significantly with season (P>0.05). ADF and NDF were significantly higher in species from communal ngitili than those from private ngitili (P<0.05). Above-ground herbaceous biomass and bulk density (BD) were significantly higher in the rainy season and in the private ngitili than in the dry season and in the communal ngitili respectively. Cattle and goats spent considerably more time grazing and browsing respectively in the rainy season than in the dry season (P<0.05). Cattle foraging activities did not vary significantly (P>0.05) with ngitili management, but goats found to spend considerably more time browsing in the communal ngitili and more time grazing in the private ngitili (P<0.05). Despite the merits of stocking cattle and goats together in the heterogeneous pasture, seasonal variation in forage resources requires investigation of other strategies such as use of multipurpose trees and treatment of crop residues to improve livestock production. 相似文献
14.
Pan Sun Hongzhi Xiao Jianzhong Wang Suxia Zhang Xingyuan Cao 《Journal of veterinary pharmacology and therapeutics》2020,43(2):237-240
The pharmacokinetics of carbetocin, which is used to control postpartum hemorrhage after giving birth, was studied in cows and gilts after a single intravenous (IV) or intramuscular (IM) injection. Blood samples from animals were assessed by oxytocin radioimmunoassay, and then the pharmacokinetic parameters were calculated using a noncompartmental model. For gilts, there was no significant difference between half-life (T1/2λZ), mean residue time (MRT), and maximum concentration (Cmax) between IM and IV administration. Conversely, the time to reach the Cmax (Tmax) and MRT were higher following administration of 350 μg/animal in cows via the IM administration compared with IV. The longest T1/2λZ was 0.85 hr, indicating carbetocin was absorbed and eliminated rapidly in both animal species after administration. The Tmax was similar between cows and gilts following IM administration. Moreover, the Cmax after IM injection was about half that of IV administration in both animals. The bioavailability was more than 80% in cows, suggesting administration via the IM route is efficient. This is in agreement with the longer T1/2λZ in cows after IM administration. However, the IV route is recommended for gilts due to a lower bioavailability (35%) and shorter T1/2λZ after IM administration compared with IV. 相似文献
15.
Shu Yang Hu John A. Starr Radhika Gharpure Shaylee P. Mehta Katherine A. Feldman Christina A. Nelson 《Zoonoses and public health》2019,66(7):805-812
Tickborne diseases (TBDs) such as Lyme disease (LD), babesiosis, ehrlichiosis and Rocky Mountain spotted fever cause substantial morbidity and even mortality in the USA. Data indicate that Hispanic populations may be at greater risk for occupational exposure to ticks and disseminated LD; however, information on knowledge and practices of Hispanic populations regarding TBDs is limited. We surveyed 153 Hispanic and 153 non‐Hispanic residents of Maryland and Virginia to assess awareness of TBDs, prevention practices and risk of tick encounters. Hispanic respondents were less likely than non‐Hispanics to report familiarity with LD symptoms (21% vs. 53%, p < 0.001) and correctly identify ticks as vectors of LD (40% vs. 85%, p < 0.001). Although there was no significant difference in overall proportion of respondents who routinely take one or more preventive measures to prevent tick bites (59% vs. 61%, p = 0.65), Hispanics were more likely to report showering after coming indoors (36% vs. 25%, p = 0.04) but less likely to conduct daily tick checks compared with non‐Hispanics (17% vs. 35%, p < 0.001). History of tick bite or finding a tick crawling on oneself or a household member in the past year did not significantly differ between Hispanics and non‐Hispanics (19% vs. 24%, p = 0.26). Notably, after controlling for Hispanic/non‐Hispanic ethnicity, primary language (English vs. Spanish) was a significant predictor of whether an individual had knowledge of LD symptoms, correctly identified ticks as vectors for LD and performed daily tick checks. These results provide guidance for future development of more targeted and effective TBD prevention education for both Hispanic and non‐Hispanic communities. 相似文献
16.
Yosuke Sasaki Tadaaki Tokunaga Ryoko Uemura Masuo Sueyoshi 《Animal Science Journal》2014,85(3):213-218
We investigated the reproductive and lifetime performances of Kagoshima Berkshire gilts and sows. We examined 20 605 parity records of 4419 pigs for 2008 to 2012 on a farrow‐to‐finish commercial farm. The mean parity (± SD) of all animals was 3.0 ± 2.1. For farrowing performance, the highest numbers of total pigs born and pigs born alive were found in sows with parities 5 and 6 and with parity 3–6, respectively (P < 0.05). Regarding weaning and mating performance, sows with parity 2 had the lowest preweaning mortality (P < 0.05). The longest weaning‐to‐first‐mating interval was found in parity 1 pigs, and the interval decreased as parity increased (P < 0.05). Parities 0 and 1 pigs had the lowest farrowing rate and those with parity 4 had the highest farrowing rate (P < 0.05). The mean parity at culling, total number of pigs born alive in a lifetime, and nonproductive days in a lifetime were 5.5 ± 2.93, 49.2 ± 24.72 pigs, and 132.1 ± 83.34 days, respectively. These animals had a lower litter size and fertility that the F1 crossbred sows mainly used in Japan, but a similar tendency for performance by parity. 相似文献
17.
S Nandi V Girish Kumar HS Ramesh BM Manjunatha PSP Gupta 《Reproduction in domestic animals》2009,44(1):74-79
Studies were conducted to examine the effects of the cyclicity and the presence of a dominant follicle (DF) in ovary on the recovery and in vitro growth of pre-antral follicles (PFs) in sheep and buffalo. Small pre-antral follicles (SPFs, 100–250 μm) and large pre-antral follicles (LPFs, 250–450 μm) were isolated from slaughterhouse ovaries in the breeding seasons by a mechanical and enzymatic method. The sheep and buffalo PFs were cultured in vitro for 6 and 15 days, respectively, and examined for their growth, survival and antrum formation rates and growth rates of oocytes in cultured pre-antral follicles. The follicles of the sheep and buffalo were recovered and cultured simultaneously within replicates. The recovery rates (number per ovary) of both SPFs and LPFs were significantly (p < 0.05) higher in cyclic ewes (SPFs: 22.0 ± 3.3 vs 12.1 ± 2.6 and LPFs: 16.0 ± 3.6 vs 9.2 ± 1.8) and buffaloes (SPFs: 9.2 ± 1.3 vs 4.1 ± 1.0 and LPFs: 10.3 ± 2.7 vs 5.4 ± 0.7) compared with those recovered from acyclic ones. Presence of a DF in ovary significantly (p < 0.05) reduced the recovery rates of LPFs in ewes (9.06 ± 2.7 vs 16.4 ± 3.8) but had no effect in buffalo. Cyclicity of animals or follicular dominance had no effects on in vitro growth, survival and antrum formation rates and growth rates of oocytes in cultured PFs of SPFs and LPFs in both sheep and buffalo. The in vitro growth, survival and antrum formation rates of LPFs and growth rates of oocytes in cultured LPFs were significantly (p < 0.05) higher than those observed in SPFs in both sheep and buffalo. The overall recovery and growth rates of the PFs were lower in buffaloes compared with ewes. 相似文献
18.
19.
Frederick M. LeMieux Courtney P. Villemarette Eddie K. Lyons Thomas H. Shields Norman German 《动物营养（英文）》2021,7(1):127
Three experiments (Exp. 1, n = 144 broilers [Ross × Ross]; Exp. 2, n = 118 mallard ducklings [Anas platyrhynchos]; and Exp. 3, n = 75 mature mallard ducks) were conducted to determine the effects of 3 levels of unmilled hybrid rice on growth performance and organ and gastrointestinal tract development. The dietary treatments were 1) corn-soybean meal (basal), 2) basal + 5% hybrid rice, and 3) basal + 10% hybrid rice for Exp. 1 to 3, respectively. One bird from each pen in Exp. 1 (n = 24) and all the birds in Exp. 2 (n = 118) and Exp. 3 (n = 75) were randomly selected and euthanized to determine linear measurements and organ and gastrointestinal tract weight. In Exp. 1 and 2, birds fed 10% rice experienced slower growth (P < 0.05) than birds fed the basal diet. In Exp. 3, the addition of rice did not affect growth performance. Rice addition did not affect organ length or weight (P > 0.05) in Exp. 1. However, birds fed 5% rice had significantly increased (P < 0.05) pancreas, ileum, and jejunum weights in Exp. 2, and 10% rice significantly increased (P < 0.05) liver weight in Exp. 3. The addition of 10% unmilled rice to broiler and duck diets may reduce growth performance. 相似文献
20.
生育期和品种对紫花苜蓿产量及品质的影响 总被引：1，自引：0，他引：1
为了获得最佳的紫花苜蓿（Medicago sativa）品种和刈割期,分别对'关中苜蓿’、'阿尔冈金’、'金皇后’在现蕾期、初花期、盛花期、结荚期和成熟期进行刈割,了解不同苜蓿品种在各生育期的产量及营养特性。结果表明：3个品种中,‘金皇后’的粗蛋白、粗灰分、相对饲用价值含量最高,分别为16.86% DM,7.97% DM和106.22% DM;'金皇后’的中性洗涤纤维、酸性洗涤纤维含量最低,分别为51.08% DM和41.04% DM。‘金皇后’在现蕾期,粗蛋白、粗灰分、相对饲用价值含量最高,分别为18.99% DM,9.07% DM和127.15% DM,中性洗涤纤维、酸性洗涤纤维含量最低,分别为44.98% DM和35.78% DM。综上所述,3个苜蓿品种中,‘金皇后’的产量及营养价值最高,品质最好,现蕾期是最佳的刈割时期。 相似文献