甘南高原独一味间作栽培藏木香对独一味生长的影响     

何淑玲  王改花  董利俊  齐军  汤文江  法小梅  王丽  尤艳娇 《广东农业科学》2012,39(9):20-21,34

采用田间随机区组法研究甘南高原独一味间作栽培藏木香对独一味出苗率、成活率、叶长、叶宽和株高的影响。结果表明,独一味间作栽培藏木香时,当年生独一味的出苗率、成活率比单作极显著提高;两年生独一味的叶长、叶宽和株高的生长变化也比单作显著加快。该研究攻克了独一味大田栽培中成活率低的技术难关,对独一味的人工栽培有一定的指导意义。  相似文献   

Free range and deep litter poultry production systems: effect on performance, carcass yield and meat composition of cockerel chickens     

Olajide Mark Sogunle  Olagoke Ayobami Olaniyi  Lawrence Tokunbo Egbeyale  Olufemi Sunday Akinola  Taofeek A. Shittu  Samuel Soladoye Abiola  Abimbola O. Ladokun  Richard Abayomi Sobayo 《Tropical animal health and production》2012,45(1):281-288

This study was carried out on 150 cockerel chickens each of Harco Black and Novogen strains to determine their performance, carcass yield and meat composition on free range and deep litter production systems. The birds were brooded for 4 weeks and thereafter allotted to the different production systems for a period of 12 weeks. Each production system was allotted 150 chicks (75 chicks per strain) with three replicates of 25 chicks. The birds on deep litter production system were fed ad libitum while each bird on free range was fed 50 % of its daily feed requirement. On the 84th day, a total of 36 birds were randomly selected for analysis of the carcass yield and meat composition. The data generated were subjected to a two-way analysis of variance in a 2?×?2 factorial experimental arrangement. Novogen strain consumed less feed (P?<?0.05) on free range and had the best feed/gain (2.72). A higher (P?<?0.05) shear force value (3.74 N) was obtained in the thigh muscle for birds on free range. The tibia proximal length and breadth, and tibia distal length and breadth were significantly (P?<?0.05) affected by the production systems and strains. On free range, Harco black had more meat (85.69 g) than bone (18.07 g) in the breast while Novogen had the lowest meat/bone (2.38). Conclusively, Novogen strain should be raised on free range for a better performance in terms of feed/gain, but for higher meat composition, Harco black is a better strain.  相似文献   

Dynamical Instabilities and the Formation of Extrasolar Planetary Systems     

FA Rasio  EB Ford 《Science (New York, N.Y.)》1996,274(5289):954-956

The existence of a dominant massive planet, Jupiter, in our solar system, although perhaps essential for long-term dynamical stability and the development of life, may not be typical of planetary systems that form around other stars. In a system containing two Jupiter-like planets, the possibility exists that a dynamical instability will develop. Computer simulations suggest that in many cases this instability leads to the ejection of one planet while the other is left in a smaller, eccentric orbit. In extreme cases, the eccentric orbit has a small enough periastron distance that it may circularize at an orbital period as short as a few days through tidal dissipation. This may explain the recently detected Jupiter-mass planets in very tight circular orbits and wider eccentric orbits around nearby stars.  相似文献   

Assessment of organoleptic postmortem inspection techniques for bovine offal     

FA UZAL  SJ MORE  B. DOBRENOV  WR KELLY 《Australian veterinary journal》2002,80(1):70-74

Objective To evaluate organoleptic postmortem inspection techniques for bovine livers and kidneys.
Study design At Australian export abattoirs, bovine liver and kidneys are assessed and graded by qualified meat inspectors during normal operations. Over a 12-month period at a large abattoir in eastern Australia during 1997 and 1998, a sample of these organs was reassessed independently using a range of pathological and microbiological methods. Agreement between routine inspection and independent assessment was evaluated using methods of inter-rater agreement.
Results A total of 944 livers and 1374 kidneys were included in the study. All of these organs had been classified during routine inspection. The authors examined 363 livers and 329 kidneys both grossly and histologically, including 36 livers and 14 kidneys that were also subjected to microbiological examination. All other organs were only examined grossly. There was only a moderate level of agreement between the routine and independent assessment methods. For livers, the percentage agreement was 80.2%, McNemar's test of symmetry 55.2 (3 degrees of freedom, P < 0.001) and kappa 0.63. For kidneys, the percentage agreement was 67.8%, McNemar's test of symmetry 9.9 (1df, P = 0.002) and kappa 0.35.
Conclusions The results reinforce concerns from a number of authors about organoleptic postmortem inspection. Risk assessment methodologies offer the opportunity to modify inspection techniques in a manner that is most relevant to current public health concerns.  相似文献   

Unilateral Nephrectomy in a Juvenile Llama     

LINDA VAN HOOGMOED DVM  Diplomate ACVS    JACK R. SNYDER DVM  PHD  Diplomate ACVS    GREGORY ROBERTS DVM  MS  Diplomate ACVR  FA YE A. HARMON 《Veterinary surgery : VS》1997,26(6):497-501

Objective —The purpose of this study was to decribe the clinical presentation, diagnostic evaluation, and surgical management of a llama with an ectopic ureter.
Animals or Sample Population —Nine-month-old female llama.
Results —The diagnostic evaluation included the use of computed tomography and an excretory ureterogram to confirm and identify the location of the ectopic ureter. Surgical management involved a unilateral nephrectomy.
Conclusions and Clinical Relevance —Computed tomography is a valuable asset to diagnose the presence and terminal location of an ectopic ureter in llamas, and nephrectomy appears to be a viable procedure to resolve the subsequent urinary incontinence.  相似文献   

Effect of feeding cassava (Manihot esculenta Crantz) root meal on growth performance,hydrocyanide intake and haematological parameters of broiler chicks     

Abiola Olajetemi Akapo  Abimbola Oladele Oso  Adeyemi Mustapha Bamgbose  Kehinde A. Sanwo  Adebayo Vincent Jegede  Richard Abayomi Sobayo  Olusegun Mark Idowu  Juexin Fan  Lili Li  Rotimi A. Olorunsola 《Tropical animal health and production》2014,46(7):1167-1172

The effect of feeding cassava root meal on growth performance, hydrocyanide intake, haematological indices and serum thiocyanate concentration of broiler chicks was investigated using 300-day-old male broilers. There were five dietary treatments arranged in a 2?×?2?+?1 factorial arrangement of two processing methods of cassava root (peeled and unpeeled) included at two levels (100 and 200 g/kg) plus a control diet (maize-based diet, containing no cassava root). Each treatment was replicated six times with ten birds per replicate. The feeding trial lasted for 28 days. Control-fed birds had the highest overall (P?P?P?P?P?P?P?P?P?P?P?P?P?P?相似文献   

猪繁殖和呼吸综合征的研究进展     

FA Osorio  唐文渊 《国外畜牧学(猪与禽)》2003,23(2):55-56

从近二年来已经发表或即将发表的文献来看,猪繁殖和呼吸综合征的研究已经取得了一些极为显著的进展。  相似文献   

Fertility of N'dama and Bunaji Cattle to Artificial Insemination Following Oestrus Synchronization with PRID and PGF2α in the Hot Humid Zone of Nigeria     

Voh AA  Larbi A  Olorunju SA  Agyemang K  Abiola BD  Williams TO 《Tropical animal health and production》2004,36(5):499-511

A study was undertaken to determine the effectiveness of a progesterone-releasing intravaginal device (PRID) and prostaglandin F2 alpha (PGF2alpha) in synchronizing oestrus in N'dama and Bunaji cows and heifers and the fertility following artificial insemination at the synchronized oestrus. A total of 116 cows and heifers (58 N'dama and 58 Bunaji) were used in two separate trials. In the first trial, oestrus was synchronized using a PRID, which was inserted for 12 days; in the second trial, oestrus was synchronized by giving two injections of PGF2alpha 13 days apart. Only animals that did not respond to the first injection were given the second injection. At the end of each treatment period, the animals were observed for oestrus for 7 days and inseminated approximately 12 h following detection of oestrus. Standing to be mounted was the single criterion used to judge an animal to have been in oestrus. PGF2alpha and PRID were both effective in synchronizing oestrus in N'dama and Bunaji cows and heifers. The respective oestrus response rates, pregnancy rate and conception rates for PRID and PGF2alpha were 85.7%, 53.6% and 62.5% for PRID, and 91.7%, 68.3% and 74.6% for PGF2alpha. N'dama cattle showed significantly (p<0.05) better oestrus response rate, pregnancy rate and conception rate than Bunaji cattle following both PRID and PGF2alpha treatments. The pregnancy rate and conception rate following PGF2alpha treatment were better (p < 0.05) than for PRID, although the oestrus response rate did not differ. It is concluded that both PRID and PGF2alpha are effective in synchronizing oestrus in N'dama and Bunaji cattle in the hot humid zone of Nigeria and the fertility to artificial insemination at the synchronized oestrus was normal and acceptable. Thus, PRID and PGF2alpha can effectively be used in intensive breeding programmes for the rapid multiplication and distribution of both cattle breeds, especially the N'dama, which is a unique and beneficial animal genetic resource for the tsetse infested hot humid zone of Nigeria.  相似文献   

Endometrial nitric oxide synthase activity in mares susceptible or resistant to persistent breeding‐induced endometritis and the effect of a specific iNOS inhibitor in vitro          下载免费PDF全文

FA Khan  TS Chenier  RA Foster  J Hewson  EL Scholtz 《Reproduction in domestic animals》2018,53(3):718-724

Emerging research suggests that the nitric oxide system may play a role in persistent breeding‐induced endometritis (PBIE) in the mare. Differences in uterine nitric oxide (NO) levels between mares susceptible or resistant to PBIE and a dose‐dependent inhibitory effect of NO on uterine contractility have been demonstrated. The objectives of this study were to investigate the difference in total nitric oxide synthase (NOS) activity of the endometrium between susceptible and resistant mares and the effect of a specific inducible nitric oxide synthase (iNOS) inhibitor on the endometrial NOS activity in vitro. Six susceptible and six resistant mares were selected based on preset criteria and the results of an intrauterine challenge with killed spermatozoa during oestrus. Endometrial biopsy samples were collected 24 hr post‐challenge and cultured at 37°C for 24 hr in L‐arginine supplemented minimum essential medium with or without a specific iNOS inhibitor (1,400 W dihydrochloride, 1 mM). The medium and the cultured endometrial tissue were collected after 24 hr of culture and assayed for NO and total protein, respectively. Total NO content of the medium, normalized to endometrial tissue wet weight or total protein, was used as a measure of endometrial NOS activity. Non‐parametric tests were applied for statistical analysis. Susceptible mares had significantly greater endometrial NOS activity than resistant mares. The iNOS inhibitor treatment significantly reduced NOS activity in endometrial samples derived from susceptible and resistant mares. These findings provide a basis for in vivo testing of specific iNOS inhibitors as preventative or therapeutic options for PBIE in mares.  相似文献   

红莲型细胞质雄性不育恢复系特青和珍汕97的恢复性遗传分析     

梁国华  法锦宁  杨华  汤述翥  顾铭洪 《扬州大学学报(农业与生命科学版)》2001,22(1):7-11

以花粉育性和小穗育性为指标 ,对红莲型细胞质雄性不育系丛广 4 1 A、恢复系特青以及丛广 4 1 A/特青的 F1 、F2 ,丛广 4 1 A∥丛广 4 1 B/特青的三交 F1 等亲本和杂种群体的育性调查分析结果表明 :特青具有 1个主效的显性恢复基因 ,该基因暂命名为 Rf-5(t) ;对红莲型细胞质雄性不育系丛广 4 1 A、恢复系珍汕 97以及丛广 4 1 A/珍汕 97的 F1 、F2 ,丛广 4 1 A∥丛广 4 1 B/珍汕 97的三交 F1 等亲本和杂种群体的育性调查分析结果表明 :在红莲型细胞质雄性不育和恢复性上 ,这 2个亲本之间可能有两类基因 ,其中一类控制着圆败型花粉 ,另一类控制着典败型花粉 ;对丛广 4 1 A∥珍汕 97/特青三交 F1 的育性调查分析结果表明 :珍汕 97具有一个与 Rf-5(t)等位的恢复基因  相似文献