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61.
62.
本试验的目的是研究提早具有较快生长速度(GR)的小母猪的配种时间,是否会降低其头3胎的繁殖性能、提高其1~3胎的淘汰率。试验选用568头Camborough 22小母猪,按配种时的体重和年龄分成3组:第一组(G1组)164头,生长速度高于等于700g/d,配种年龄低于210d;第二组(G2)165头,生长速度高于等于700g/d,配种年龄高于210d;第三组(G3)239头,生长速度低于700g/d,配种年龄高于210d。所有试验小母猪从150d起采取自由采食,并于其第二个或随后的发情期配种。第一胎,G2组小母猪的平均产仔数多于其它组(P<0.05)。然而,在对三胎产仔数进行分析后表明,各组小母猪在总产仔数(分别为11.6、12.3和11.7头)、分娩率(分别为87.1%、88.7%和和89.8%)和淘汰率(分别为30.2%、25.3%和28.2%)上没有显著差异(P>0.05)。因此,日龄在185~210d、体重为127kg的小母猪,可以在其第二个或随后的发情期中给予配种,且配种不会影响其头3胎的生产性能。 相似文献
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Rodrigues-Alves PS Lebrun I Flório JC Bernardi MM Spinosa Hde S 《Research in veterinary science》2008,84(1):100-106
The moxidectin (MXD) is an antiparasitic drug used in domestic animals. The mechanism of action, in mammals, involves GABA, a neurotransmitter with an important role in the sexual behavior control. Presently, the effects of 0.2 mg/kg therapeutic dose were studied on sexual behavior, sexual motivation, penile erection and central GABA levels. Sexual behavior results showed increased latencies to the first mount and intromission as well as in inter-intromission interval; a reduction in total mounts was detected on the drug post-treatment. No difference was observed between sexual motivation of control and experimental animals. MXD treatment reduced penile erection and hypothalamic GABA levels. The results suggest that MXD reduced sexual behavior and penile erection by an action on the hypothalamic GABA system. Probably, the lack of effects in the motivational test and the increased mount and intromission latencies as well as decreased total mounts could be explained as a consequence of reduced male rat erection process. 相似文献
65.
Daniel Bernardi Marcos Botton Uemerson Silva da Cunha Oderlei Bernardi Thibaut Malausa Mauro Silveira Garcia Dori Edson Nava 《Pest management science》2013,69(1):75-80
BACKGROUND: The spider mite, Tetranychus urticae, is the major strawberry pest in Brazil. The main strategies for its control comprise synthetic acaricides and predatory mites. The recent register of a commercial formula of azadirachtin (Azamax® 12 g L?1) can be viable for control of T. urticae. In this work, the effects of azadirachtin on T. urticae and its compatibility with predatory mites Neoseiulus californicus and Phytoseiulus macropilis in the strawberry crop were evaluated. RESULTS: Azadirachtin was efficient against T. urticae, with a mortality rate similar to that of abamectin. In addition, the azadirachtin showed lower biological persistence (7 days) than abamectin (21 days). Azadirachtin did not cause significant mortality of adult predatory mites (N. californicus and P. macropilis), but it did reduce fecundity by 50%. However, egg viability of the azadirachtin treatments was similar to that of the control (>80% viability). The use of azadirachtin and predatory mites is a valuable tool for controlling T. urticae in strawberry crop. CONCLUSIONS: Azadirachtin provided effective control of T. urticae and is compatible with the predatory mites N. californicus and P. macropilis. It is an excellent tool to be incorporated into integrated pest management for strawberry crop in Brazil. Copyright © 2012 Society of Chemical Industry 相似文献
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RA McKenzie AM Carmichael ML Schibrowski SA Duigan JA Gibson JD Taylor 《Australian veterinary journal》2009,87(1-2):27-32
Polioencephalomalacia was diagnosed histologically in cattle from two herds on the Darling Downs, Queensland, during July–August 2007. In the first incident, 8 of 20 18-month-old Aberdeen Angus steers died while grazing pastures comprising 60% Sisymbrium irio (London rocket) and 40% Capsella bursapastoris (shepherd's purse). In the second incident, 2 of 150 mixed-breed adult cattle died, and another was successfully treated with thiamine, while grazing a pasture comprising almost 100% Raphanus raphanistrum (wild radish). Affected cattle were either found dead or comatose or were seen apparently blind and head-pressing in some cases. For both incidents, plant and water assays were used to calculate the total dietary sulfur content in dry matter as 0.62% and 1.01% respectively, both exceeding the recommended 0.5% for cattle eating more than 40% forage. Blood and tissue assays for lead were negative in both cases. No access to thiaminase, concentrated sodium ion or extrinsic hydrogen sulfide sources were identified in either incident. Below-median late summer and autumn rainfall followed by above-median unseasonal winter rainfall promoted weed growth at the expense of wholesome pasture species before these incidents. 相似文献
69.
Haematological, biochemical and selected acute phase protein reference intervals for weaned female Merino lambs 总被引:1,自引:0,他引:1
Background Merino lambs are currently the subject of much research into the welfare aspects of mulesing and mulesing alternatives.
Objective Obtain haematology, biochemistry and acute phase protein reference intervals using modern methodologies for female Merino lambs.
Method Blood was collected from 50, weaned, 9- to 16-week-old, female Merino lambs. Haematology and biochemistry panels were performed using routine automated methods. The acute phase proteins, fibrinogen, serum amyloid A and haptoglobin, were also measured using commercially available techniques. The reference intervals were determined to be the central 95% of results.
Results Differences in the concentrations for some analytes were seen when compared with reported studies in sheep, but may be explained by the use of sheep of a different signalment, as well as different methodologies for analyte measurement. Overall, most analytes gave similar values to those previously reported in other studies. Notable exceptions were alkaline phosphatase, phosphate and globulins, for which the different results were often attributed to the younger age of the sheep in the present study, and platelets and creatine kinase, for which the elevated levels may have been a result of stress and muscle exertion associated with blood collection and husbandry practices.
Conclusion Established haematological, biochemical and acute phase protein reference intervals are necessary for the investigation of the systemic impact of mulesing and mulesing alternatives and for the investigation of systemic diseases affecting weaned, 9- to 16-week-old, female Merino lambs in general. 相似文献
Objective Obtain haematology, biochemistry and acute phase protein reference intervals using modern methodologies for female Merino lambs.
Method Blood was collected from 50, weaned, 9- to 16-week-old, female Merino lambs. Haematology and biochemistry panels were performed using routine automated methods. The acute phase proteins, fibrinogen, serum amyloid A and haptoglobin, were also measured using commercially available techniques. The reference intervals were determined to be the central 95% of results.
Results Differences in the concentrations for some analytes were seen when compared with reported studies in sheep, but may be explained by the use of sheep of a different signalment, as well as different methodologies for analyte measurement. Overall, most analytes gave similar values to those previously reported in other studies. Notable exceptions were alkaline phosphatase, phosphate and globulins, for which the different results were often attributed to the younger age of the sheep in the present study, and platelets and creatine kinase, for which the elevated levels may have been a result of stress and muscle exertion associated with blood collection and husbandry practices.
Conclusion Established haematological, biochemical and acute phase protein reference intervals are necessary for the investigation of the systemic impact of mulesing and mulesing alternatives and for the investigation of systemic diseases affecting weaned, 9- to 16-week-old, female Merino lambs in general. 相似文献
70.
Kessler JD Kahle KT Sun T Meerbrey KL Schlabach MR Schmitt EM Skinner SO Xu Q Li MZ Hartman ZC Rao M Yu P Dominguez-Vidana R Liang AC Solimini NL Bernardi RJ Yu B Hsu T Golding I Luo J Osborne CK Creighton CJ Hilsenbeck SG Schiff R Shaw CA Elledge SJ Westbrook TF 《Science (New York, N.Y.)》2012,335(6066):348-353