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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
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
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Effect of Dietary a-Tocopheryl Acetate on TissueDistribution of Vitamin E and Semen Quality of RabbitBucks
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Effect of LPS-induced inflammatory state on some aspects of reproductive function of rabbit does
No full textUtilizzo di una vagina artificiale digitale per il prelievo del seme di coniglio: risultati preliminari
No full textOvulation induction in rabbit does submitted to artificial insemination by adding lecirelin to the semen dose: preliminary results.
No full textParámetros productivos, inmunidad innata sérica y de la mucosa digestiva de gazapos alimentadoscon dietas suplementadas con bacitracina de zinc o ácidos orgánicos protegidos. Proc. II° Congreso Ibérico de Cunicultura
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