1,721,019 research outputs found
EFFECT OF COLLECTION FREQUENCY ON RABBIT SEMEN PRODUCTION
No full text[EN] The effect of collection frequency on the volume,
concentration, motility and live sperm of rabbit semen was studied.
Ten crossbreed Hyla bucks were used in two groups (five per group}
during 17 weeks. In the extensive rhythm, two ejaculates per male
were collected 10-15 minutes apart on one day each week. In the
semi-intensive group two ejaculates per day were collected on
two consecutive days each week, The proportion of useful
ejaculates obtained decreased as collection frequency increased
(O. 75 and 0.58 for the extensive and semi-intensive rhythms,
respectively). Among the ejaculate characteristics studied -
volume/ejaculate, sperm concentration, motility, live sperm - only volume/ejaculate showed significant differences between rhythms
(0.68±0.06 and 0.57±0.01 mi for the extensive and semi-intensive
rhythms, respectively). The number of doses (20 million
spermatozoa) produced per ejaculate decreased as collection
frequency increased, but the number of doses produced per week
was higher in the semi-intensive than in the extensive rhythms
(28.8±1.5 and 23.3±2.0 doses/week, respectively). These results
suggest that semi-intensive rhythms should be used, at least at
times of the year that are less favourable for male libido, in arder
to obtain a larger number of doses per week.[FR] Les conséquences de 2 rythmes de prélevement de la
semence ont été étudiées sur le volume, la concentration, la
moti lité et le taux de spermatozo'ides vivants, en utilisant 1 O lapins
adultes de génotype Hyla. Pendant 17 semaines, 5 sujets ont été
prélevés deux fois de suite, un jour par semaine (rythme extensif)
et les 5 autres lapins ont été prélevés deux fois de suite, deux
jours consécutifs (rythme semi-intensif). La proportion d'éjaculats
utilisables pour l'insémination artificielle est plus faible en rythme
semi-intensif qu'en rythme extensif (0.58 vs 0.75). Parmi les criteres étudiés sur les éjaculats - volume, concentralion en
spermatozo'ides, taux de motilité, proportion de spermatozo'ides
vivants - seul le volume est significativement affecté par le rythme
le plus intensif (0.57±0.01 vs 0.68±0.06 mi). Le nombre de doses
utilisables pour l'insémination par éjaculat décroit avec le rythme
le plus intensif, mais le nombre de doses utilisables produites par
semaine est significativement plus élevé avec le rythme semiintensif
(28.8±1.5 vs 23.3±2.0 doses/semaine).Nizza, A.; Di Meo, C.; Taranto, S.; Stanco, G. (2002). EFFECT OF COLLECTION FREQUENCY ON RABBIT SEMEN PRODUCTION. World Rabbit Science. 10(2). https://doi.org/10.4995/wrs.2002.475SWORD10
PREDICTION OF NUTRITIVE VALUE OF DIETS FOR RABBITS USING AN IN VITRO GAS PRODUCTION TECHNIQUE
No full text[EN] Thirty-one mixed diets for rabbits (DE concentration from 8.44 to 12.29 MJ/kg) were used to predict the digestibility of dry matter (dDM), organic matter (dOM), gross energy (dGE) and digestible energy concentration (DE) from some in vitro gas production parameters, using frozen caecal content from rabbits. Step-wise multiple regression analysis showed that the most significant contribution to the variation expressed by dDM, dOM, dGE and DE arises from crude fibre content (CF). Multiple regression analysis considered more than one independent variable, but it gave only marginally improvements in terms of the accuracy of digestibility prediction. The best equations in terms of R2 and residual standard deviation (RSD) values were: DE (MJ/kg DM) = 0.75 - 0.291 CF - 0.208 ADL + 0.856 GE (R2 = 0.895, RSD 0.279) and dOM (%) = 91.8 - 1.756 CF - 1.283 ADL (R2 = 0.849, RSD 1.655) where CF = crude fibre (%DM), ADL = acid detergent lignin (%DM), GE = gross energy (MJ/kg DM). Dry matter loss (DMl, %) was the in vitro gas production parameter which correlated most closely with dDM, dOM, dGE and DE. The best prediction equations were: DE (MJ/kg DM) = -3.14 + 0.217 DMl + 0.114 B (R2 = 0.734, RSD 0.437) and dOM (%) = - 6.80 + 1.078 DMl + 0.456 B (R2 = 0.691, RSD 2.368), where B is the incubation time (h) at half potential gas. When data of the chemical composition and from fermentation parameters were included concurrently in the model, the most significant contribution to the variation explained of dDM, dOM, dGE and DE still arose from CF. These results suggest that in vitro gas production could be an interesting method of predicting the nutritive value of rabbit diets, but further investigations are required to increase caecal inoculum standardisation and its prediction ability.Stanco, G.; Di Meo, C.; Calabrò, C.; Nizza, A. (2003). PREDICTION OF NUTRITIVE VALUE OF DIETS FOR RABBITS USING AN IN VITRO GAS PRODUCTION TECHNIQUE. World Rabbit Science. 11(4):199-210. https://doi.org/10.4995/wrs.2003.508SWORD19921011
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Capacità digestiva della lepre allevata in cattività.
No full textLa presente ricerca ha permesso di acquisire ulteriori conoscenze relative al comportamento alimentare ed alla capacità di utilizzazione digestiva delle sostanze nutritive della dieta da parte della lepre europea allevata in cattività. I risultati ottenuti hanno confermato la migliore capacità di utilizzazione digestiva della lepre nei confronti del coniglio
Effect of laying age on the production, hatchability and on the physical characteristics of ostrich eggs.
No full textThe use of in vitro gas production to characterise The fermentation pattern of the caecal content of hare: A preliminary study.
No full textValencia (Spain
Effect of duration of storage of the frozen inoculum to be used in rabbit in vitro gas production technique.
No full textCapacità digestiva della lepre allevata in cattività
No full textLa presente ricerca ha permesso di acquisire ulteriori conoscenze relative al comportamento alimentare ed alla capacità di utilizzazione digestiva delle sostanze nutritive della dieta da parte della lepre europea allevata in cattività. I risultati ottenuti hanno confermato la migliore capacità di utilizzazione digestiva della lepre nei confronti del coniglio
EFFECT OF STORAGE DURATION ON FROZEN INOCULUM TO BE USED FOR THE IN VITRO GAS PRODUCTION TECHNIQUE IN RABBIT.
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