389 research outputs found
Existence theorems for periodic semilinear impulsive problems (viable and not viable cases)
No full textIn this paper we prove the existence of solutions for a periodic impul-
sive problem monitored by a semilinear dierential inclusion. We study the problem both in the viable case and in the not
viable one and, for the not viable problem, and in both cases we obtain theorems which improve
results already appeared in the literature
On the existence of solutions for nonlinear impulsive periodic viable problems
No full textIn this paper we prove the existence of periodic solutions for nonlinear impulsive viable problems monitored by differential inclusions of the type x' (t) is an element of F (t, x(t)) + G (t, x(t)). Our existence theorems extend, in a broad sense, some propositions proved in [10] and improve a result due to Hristova-Bainov in [13]
Periodic solutions of nonlinear impulsive differential inclusions with constraints
No full textIn this paper we obtain the existence of periodic solutions for nonlinear "invariance" problems monitored by impulsive differential inclusions subject to impulse effects
Long term effect of post-weaning rhythm on the body fat and performance of rabbit does
No full textBody condition scoring (BCS) is widely used to evaluate the nutritional status of livestock (cows, ewes, sows). In intensive systems,
rabbit does are generally inseminated 11 days post partumand, due to a hormonal antagonism and an energy deficit caused by concurrent
lactation and pregnancy, they show low fertility. The aim of this investigation was to assess an in vivo method for scoring the body
condition of does by verifying the association with the body fat depots, the chemical composition of body tissues, the ovarian status, the
hormonal response and the reproductive performance. The evaluation of BCS, involving 66 multiparous lactating does inseminated at
11 days post partum, was based on the test of bone protrusions and fullness of muscle of the loin, rump and hind leg. The traits were
subjectively scored using 0, 1 and 2 for poor, intermediate and good condition, respectively. For calculating an aggregate BCS, the hind
leg score was omitted, because it is less correlated with the real body condition. Adding the respective score (0–2) of the loin and rump
regions, 5 classes of BCS were obtained (0–4). This aggregate BCS was highly correlated with the body fat depots (r=0.79), the ether
extract content of muscle samples of Obliquus abdominis (r=0.87) and Biceps femoris (r=0.84), and the ether extract of the empty body
(r=0.84). There was a lower correlation with the body weight (r=0.45). The increase of BCS corresponded to higher lipid content in the
body parts considered, especially the Obliquus abdominis (from 2.0 to 10.0%) and fat depots (from 10.6 to 107.7 g/doe). BCS was not
related to ovulation rate or embryo production, but was correlated with sexual receptivity and fertility.
Plasma FSH and LH concentrations were determined by RIA, 48, 24, 0 h before and 1 h after GnRH administration and artificial
insemination.Animalswith extreme body condition scores (BCS≤1 orBCS=4) showed lower plasma FSHlevels (20.0 vs. 34.5 ng/mL)
than does with optimal body condition (2≤BCS≤3) and their preovulatory LH surge, released after GnRH administration, was less
evident (16.9 vs. 20.3 ng/mL). The poor reproductive performance of does with extremeBCS could be explained by this pituitary activity.
On day 11 post-partum, a high number of does (71.2%) had extreme BCS and showed a lower sexual receptivity (37.2%vs. 80.0%) and
fertility rate (50.9%vs. 86.6%) than does in optimal condition. On these results, the possibility of applying an in vivo method for scoring
the body condition of lactating rabbit does appears promising for use in on-farm reproductive management.
© 2007 Elsevier B.V. All rights reserved
The Neumann problem for quasilinear differential equations
No full textsummary:In this note we prove the existence of extremal solutions of the quasilinear Neumann problem , a.e. on , , in the order interval , where and are respectively a lower and an upper solution of the Neumann problem
Microbial cell-free extracts as sources of enzyme activities to be used for enhancement flavor development of ewe milk cheese
No full textFreeze-dried cell-free extracts (CFE) from Lactobacillus casei LC01, Weissella cibaria 1XF5, Hafnia alvei Moller ATCC 51815, and Debaryomyces hansenii LCF-558 were used as sources of enzyme activities for conditioning the ripening of ewe milk cheese. Compared with control cheese (CC), CFE did not affect the gross composition and the growth of the main microbial groups of the cheeses. As shown through urea-PAGE electrophoresis of the pH 4.6-soluble nitrogen fraction and the analysis of free AA, the secondary proteolysis of the cheeses with CFE added was markedly differed from that of the CC. Compared with CC, several enzyme activities were higher in the water-soluble extracts from cheeses made with CFE. In agreement, the levels of 49 volatile compounds significantly differentiated CC from the cheeses made with CFE. The level of some alcohols, ketones, sulfur compounds, and furans were the lowest in the CC, whereas most aldehydes were the highest. Each CFE seemed to affect a specific class of chemical compounds (e.g., the CFE from H. alvei ATCC 51815 mainly influenced the synthesis of sulfur compounds). Apart from the microbial source used, the cheeses with the addition of CFE showed higher score for acceptability than the control cheese. Cheese ripening was accelerated or conditioned using CFE as sources of tailored enzyme activities
Effect of pasture availability on the fatty acid profile and oxidative status of rabbit meat. Atti 6° CONVEGNO NAZIONALE: “Acidi grassi polinsaturi ?-3 ,CLA e Antiossidanti”,
No full textComparison of different dietary sources of PUFA n-3 on semen characteristics of rabbit bucks
No full text
Effect of Dietary a-Tocopheryl Acetate on TissueDistribution of Vitamin E and Semen Quality of RabbitBucks
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