巧治拒配母兔

(一)种兔选择和管理种公、母兔必须选择体质健壮、生殖器官发育正常非近亲的公、母兔作为种兔。公兔一般饲养7～8个月后方可配种,种公兔的饲养应特别重视饲草和饲料的品质及配合营养全面的日粮,以保证其体质健壮,性欲旺盛和精液品质优良。种公兔的配种性能受季节影响,一般春、秋季配种性能最好。母兔的饲养管理可分为空怀期、怀孕期和哺乳期三个阶段。空怀期应注意“复膘”,母兔经过30天的哺乳,体况下降,需适当加强营养,以尽早恢复体质。怀孕期母兔的能量代谢随着胎儿的增大而增加,据测定,怀孕期营养需要量比空怀期高1.5倍,应加强营养的供给…     

浅论青海省秸秆资源及其利用

在民和、乐都、湟中、湟源、格尔木等地，对我省主要农作物进行测算，得出我省主要农作物的秸秆系数为：小麦１．２５，青稞１．１０，油菜３．８１，马铃薯０．６５，蚕豆２．０１，豌豆１．７３。据此计算出１９９０年全省各类秸秆产量为：小麦秸秆９２．７１９４万ｔ油菜秸４４．７４２７万ｔ，青稞秸１９．４１万ｔ，豌豆秸１０．２５９１万ｔ，蚕豆秸１０．０４６４万ｔ。在分析秸秆利用现状的基础上，提出了对青海省秸秆资源开发利用的途径和建议。     

番茄品种耐弱光性的综合评价

研究了苗期弱光条件对幼苗素质，开花，果实大小及产量的影响，采用模糊数学的隶属法对品种的耐弱光性进行评价，并探讨了番茄耐弱光性状的鉴定方法，结果表明，苗期弱光对幼苗素质影响最大，其次影响开花，果实大小和产量，春雷２号和春雷１号属于耐弱光惭弱的品种，白果强丰属不耐弱光品种。     

农村畜禽场对环境的污染与防治

随着农业产业结构的调整，畜牧业生产规模不断扩大，集约化程度不断提高，畜禽场数量的不断增加，已成为农村这片净土的一个严重污染源，并对畜牧业自身造成了一定危害，成为养殖业发展的制约因素之一。因此防治畜禽场对环境的污染已刻不容缓。鉴于利用先进的高科技手段对畜禽粪便采取无害化处理。对农村畜禽场来讲还存在许多困难，目前建议采取以下措施进行综合防治。     

母猪难产继发膀胱积尿一例

养猪户祝某饲养母猪５头,育肥猪１３头。１０月７日,１头初产母猪难产来我院就诊,现报告如下。１发病情况该初产母猪１０月６日晚分娩,先后产出９头仔猪,每头重３００～３５０ｇ,但仍有分娩动作频频努责。３～４ｈ后,畜主开始助产,肌肉注射催产素４０ＩＵ,仍产不...     

Idiopathic pericarditis and cardiac tamponade in two cows

Idiopathic pericarditis is an uncommon diagnosis in cattle with cardiac tamponade. Two cows were examined for clinical signs of right-sided congestive heart failure, including tachycardia, venous distention, and peripheral edema. Muffled heart sounds were detected in one of the cows. Echocardiography in both cows revealed voluminous anechoic pericardial effusion and compression of the right atrium and right ventricle. Cytologic analysis of the pericardial fluid revealed hemorrhagic inflammation but no evidence of a septic or neoplastic condition such as traumatic reticulopericarditis or lymphoma, respectively. Pericardial drainage and lavage accompanied by treatment with anti-inflammatory drugs were curative in both cows. It is important to differentiate cows with idiopathic pericarditis from cows with more common septic pericarditis because the prognosis for the former disease appears to be good with appropriate treatment.     

Genotype x environmental interaction for mature size and rate of maturing for Angus,Brahman, and reciprocal-cross cows grazing bermudagrass or endophyte infected fescue

Mature weight and rate of maturing were estimated in 177 Angus, Brahman, and reciprocal-cross cows grazing bermudagrass or endophyte-infected tall fescue over a 4-yr period to evaluate genotype x environment interactions. Data were collected every 28 d until cows were approximately 18 mo of age and then at prebreeding, postcalving, and weaning of calf. All cows with weight data to at least 42 mo of age were included in the analysis. Mature weight and rate of maturing were estimated using the three-parameter growth curve model described by Brody (1945). Data were pooled over year and analyzed by the general linear model procedure of SAS. Included in the models for mature weight and rate of maturing were the independent variables of genotype, environment, and genotype x environment interaction. There was a genotype x environment interaction (P < 0.01) for mature body weight (BW) but not for rate of maturing. Angus cows grazing fescue pastures had greater (P < 0.01) mean mature BW than Angus x Brahman cows grazing bermudagrass (611 +/- 17 vs 546 +/- 16 kg). Angus x Brahman cows grazing bermudagrass had lower (P < 0.05) mean mature BW than Brahman x Angus cows grazing bermudagrass or endophyte-infected fescue and Brahman cows grazing bermudagrass (546 +/- 16 vs 624 +/- 19, 614 +/- 22 and 598 +/- 20 kg, respectively). Brahman cows grazing endophyte-infected fescue had smaller (P < 0.05) mean mature BW than all genotype x forage combinations except for Angus x Brahman cows grazing bermudagrass. Angus cows had a smaller (P < 0.05) mean rate of maturing than Angus x Brahman and Brahman x Angus cows (0.039 +/- 0.002 vs 0.054 +/- 0.002 and 0.049 +/- 0.002%/mo, respectively), respectively, and Angus x Brahman cows had a larger (P < 0.05) mean rate of maturing than Brahman x Angus and Brahman cows (0.054 +/- 0.002 vs 0.049 +/- 0.002 and 0.041 +/- 0.002 %/mo, respectively). There was a direct breed x forage interaction (P < 0.05) for mature BW. These data suggest that the choice of breed type is important in maintaining a crossbreeding program, in that mature BW and rate of maturing are critical to the matching of animal requirements to available production resources.