Reproductive performance of postpartum ewes treated with insulin or progesterone hormones in association with ram effect          下载免费PDF全文

JC Ferreira‐Silva  SRL Basto  F Tenório Filho  MT Moura  ML Silva Filho  MAL Oliveira 《Reproduction in domestic animals》2017,52(4):610-616

The reproductive performance of postpartum Santa Inês (SI) and Morada Nova (MN) ewes treated with insulin or progesterone hormones in association with ram effect was evaluated. Ewes from SI (n = 69) and MN (n = 69) breeds were randomly allocated to three groups of each breed (T1—ram effect only; T2—ram effect + insulin; T3—ram effect + progesterone). Progesterone concentrations (ηg/ml; mean ± SD) before and after introduction of rams (n = 6) were 0.51 ± 0.22 and 3.78 ± 0.68 (T1), 0.65 ± 0.21 and 3.77 ± 0.78 (T2) and 0.52 ± 0.21 and 3.84 ± 0.84 (T3) in SI ewes and 0.74 ± 0.19 and 3.71 ± 0.56 (T1), 0.70 ± 0.21 and 3.79 ± 0.75 (T2) and 0.81 ± 0.14 and 3.87 ± 0.80 (T3) in MN ewes, respectively. Thus, lower progesterone concentrations were found before the introduction of rams (p < .05). After the introduction of rams, preovulatory peaks of LH (ηg/ml) occurred at 28 (T1), 44 (T2) and 48 (T3) hr in SI ewes and at 64 (T1), 40 (T2) and 44 (T3) hr in MN ewes. The mean number of ovulations was similar between groups (p > .05), was 1.3 ± 0.51 (T1), 1.5 ± 0.54 (T2) and 1.6 ± 0.51 (T3) in SI ewes and 1.3 ± 0.51 (T1), 1.6 ± 0.51 (T2) and 1.6 ± 0.51 (T3) in MN ewes. In conclusion, the ram effect alone is effective at inducing and synchronizing oestrus in sheep under postpartum anoestrus, irrespective of hormone treatments.  相似文献   

Onset of Spermatogenesis in Meishan and Large White Male Piglets     

MT Hochereau-de Reviers  C Perreau  V Rahal-Perola  D Royere 《Reproduction in domestic animals》1999,34(3-4):213-217

  相似文献   

Letters to the Editor ◆ Letters À La Rédaction: CVMA insurance program          下载免费PDF全文

Brad R. Gilbert 《The Canadian veterinary journal. La revue veterinaire canadienne》1999,40(9):613

  相似文献   

Effect of partial harvesting strategies on Artemia biomass production in Vietnamese salt works     

Nguyen Thi Ngoc Anh  Nguyen Van Hoa  Gilbert Van Stappen  Patrick Sorgeloos 《Aquaculture Research》2010,41(9):e289-e298

The effect of partial harvest strategies on the production of Artemia biomass was evaluated for 12 weeks under Vietnamese salt farm conditions. The initial stocking density was 100 nauplii L^?1. After 3 weeks of inoculation, Artemia adults were partially harvested at intervals of 1, 3, 6 and 9 days starting with an initial quantity of 30 kg ha^?1 day^?1 at first harvest, and then the quantity of harvestable biomass was adjusted according to the standing stock present in the culture pond, combined with the time needed to harvest these quantities and with the weight of biomass harvested in each pond. The results showed that in most cases, the total densities were not significantly different among harvesting frequencies (P>0.05). However, a relatively higher Artemia adult density and its standing stock were better maintained in the 3‐day than in the 1‐day interval, and were significantly higher compared with the other two harvesting frequencies. The total biomass yields were the highest (1587 kg ha^?1) in the 3‐day harvesting interval, followed by 1‐, 6‐ and 9‐day harvesting interludes, corresponding to 1323, 1091 and 975 kg ha^?1 respectively. However, no statistical difference was observed between the 1‐ and the 3‐day interval as well as between the 6‐ and the 9‐day harvest schemes (P>0.05). The results of this study suggest that partial harvest of Artemia biomass performed every 3 days appears to be an appropriate strategy to enhance biomass productivity.  相似文献   

Killer whale predation on sea otters linking oceanic and nearshore ecosystems   总被引：2，自引：0，他引：2  

JA Estes  MT Tinker  TM Williams  DF Doak 《Science (New York, N.Y.)》1998,282(5388):473-476

After nearly a century of recovery from overhunting, sea otter populations are in abrupt decline over large areas of western Alaska. Increased killer whale predation is the likely cause of these declines. Elevated sea urchin density and the consequent deforestation of kelp beds in the nearshore community demonstrate that the otter's keystone role has been reduced or eliminated. This chain of interactions was probably initiated by anthropogenic changes in the offshore oceanic ecosystem.  相似文献   

Atomic Force Microscopy (AFM) Study of Interactions of HMW Subunits of Wheat Glutenin     

Andrew D. L. Humphris  Terence J. McMaster  Mervyn J. Miles  Simon M. Gilbert  Peter R. Shewry  Arthur S. Tatham 《Cereal Chemistry》2000,77(2):107-110

Atomic force microscopy (AFM) has been used to study the noncovalent interactions of alkylated HMW subunit 1Dx5 and a M _r 58,000 peptide derived from the central repetitive domain. Both protein and peptide align side‐by‐side to form fibrils, the HMW subunit forming a branched network, and the peptide forming linear rods. The N‐ and C‐terminal domains of the subunit would, therefore, appear to contain regions that interact through noncovalent interactions in the absence of disulfide bond formation. These regions may be of importance in facilitating disulfide bond formation during protein body development.  相似文献   

Seed potato certification notes     

F. H. Harrington  J. Tucker  Alfred H. Gilbert 《American Journal of Potato Research》1924,1(14):338-344

  相似文献   

Application of thermometric titrations to the study of soil organic matter. I. Simple polyelectrolytes     

Khaled Y. Khalaf  Patrick MacCarthy  T.W. Gilbert 《Geoderma》1975,14(4):319-330

An introduction to the technique of thermometric titrimetry is provided and its special potentialities for the study of humic substances are discussed. As a prelude to the investigation of the complicated humic systems, the relatively simple polyelectrolytes, PAA and PMA, were first studied. Thermometric titration of these polymeric acids with sodium hydroxide solution gave good end points. Thermometric titration of the salts of these acids with various transition metal ions gave end point breaks corresponding stoichiometrically to charge neutralization of the polyelectrolyte. These thermometric titrations involving the transition metal ions are compared with the corresponding nephelometric titrations.  相似文献   

Evolution of green coffee protein profiles with maturation and relationship to coffee cup quality     

Montavon P  Duruz E  Rumo G  Pratz G 《Journal of agricultural and food chemistry》2003,51(8):2328-2334

Coffee flavor is the product of a complex chain of chemical transformations. The green bean has only a faint odor that is not at all reminiscent of coffee aroma. It contains, however, all of the necessary precursors to generate the unmistakable coffee flavor during roasting. The levels and biochemical status of these precursors may vary in relation to genetic traits, environmental factors, maturation level, postharvest treatment, and storage. To improve our understanding of coffee flavor generation, the sensory and biochemical impact of maturation was assessed. Maturation clearly favored the development of high-quality flavor in the coffee brew. A specific subclass of green coffee beans, however, generated high-quality coffee flavor irrespective of maturation. Biochemical aspects were examined using a dynamic system: immature and mature green coffee suspensions were incubated under air or argon. On the analytical side, a specific pool of flavor precursors was monitored: chlorogenic acids, green coffee proteins, and free amino acids. A link between maturation, the redox behavior of green coffee suspensions, and their sensory scores was identified. Compared to ripe beans, unripe beans were found to be more sensitive to oxidation of chlorogenic acids. Aerobic incubation also triggered the fragmentation or digestion of the 11S seed storage protein and the release of free amino acids.  相似文献   

The 1949 Atlas of French peat deposits,a starting point for a national inventory of peatlands     

Lise Pinault  Malo Pilloix  Gregory Bernard  Daniel Joly  Sébastien Gogo  Elsa Martin  Daniel Gilbert 《Soil Use and Management》2023,39(3):1040-1056

Fifty per cent of European peatlands are in a damaged state. While intact peatlands are natural carbon sinks, degraded sites release important amounts of greenhouse gases into the atmosphere, contributing to global warming. Restoration of the hydrological functionality of peatlands has proved to be an efficient tool to avoid these emissions. In France, Tuffnell & Bignon's ministerial report (2019) emphasized the need for peatlands ‘integration into the National Low Carbon Strategy, targeting carbon neutrality by 2050. However, current knowledge regarding French peatlands’ distribution and carbon stocks is insufficient and does not allow decision makers and managers to prioritize areas for restoration. The most complete database to date is the 1949 Atlas, an inventory of exploitable peat deposits that was conducted during WWII for peat exploitation as fuel. Until its digitalization, the latter database was archived and never used in a scientific study. It provides detailed information about peatland surfaces, peat thicknesses and carbon contents at that time. We estimated peat carbon stocks from French peatlands to be 111 Mt C in 1949 for 63,290 ha identified as peaty sites, the equivalent of 3% of the organic carbon contained in the upper 30 centimetres of French soils. 34% of this stock was held in Lower Normandy (37.7 Mt C) and 12% in the Picardy's region (13.0 Mt C), in large lowland peatlands. However, not all peatlands were prospected in the 1949 inventory and the characteristics of the prospected peatlands may have changed with anthropic disturbances of the last decades, such as draining or climate change. These first results highlight the need for a recent inventory of French peatlands and carbon stocks based on local data aggregation. Data from the 1949 Atlas could help constituting this new inventory but should be validated before being used to describe the present.  相似文献