1,721,191 research outputs found
RECHERCHES SUR L'INTERACTION ENTRE ALIMENTATION, REPRODUCTION ET LACTATION CHEZ LA LAPINE, UNE REVUE
No full text[EN] The rabbit doe, at the beginning of its reproductiva activity
(first pregnancy first lactation or first" concurrent pregnancy
and lactation), hás a negativa energy and material balance.
The net body composition at the first parturition changes
definitely during lactation, with an important loss of lipids
(about - 40 %) and energy (- 20 %). lf the rabbit doe is
concurrently pregnant, the energy deficit becomes greater
and the nitrogen and mineral balances become negativa as
well. Consequently the second kindling litter size is lower,
(- 10 % of total youngs born and - 20 % of rabbits born
alive). Moreover, the composition of new born pups shows a
lower lipid content which can influences negatively their
viability. The energy and nitrogen requirements for
maintenance, and the coefficients of utilization of digestible
energy (DE) and digestible proteins (DP) for milk energy and protein production are given. In the case of a negativa
balance, the coefficients of utilization of body energy and
protein for milk production are also reportad.
The author's research had also the object of studying the
effect of the diet on the reproductiva performance of does. In
particular, the increase of energy intake due to diets
supplemented with fat causes an increase of milk production,
which is favourable for the litter but does not reduce the
maternal energy deficit. In addition, the number of pups born
alive at the second parturition is negatively affected.
A single "feeding strategy" is not able to solve the problem of
nutritiva deficit or avoid the unwanted effects of the
concurrent pregnancy and lactation. Therefore we have to
operate at breeding level, programming a less intensiva
remating system, reducing the number of suckling youngs
and preparing the future reproducing does from their
weaning.[FR] La lapine au début de son activité reproduct(ve
(premiere gestation, premiere lactation ou gestation et 1ere
/actation en meme temps), se trouve en bitan énergétique et
matérief négatif. La composition du corps net au moment de
la premiere mise bas chanfle sensibfement au cours de la
lactation, avec une perte tres importante de lipides (enviran
- 40 %} et d'énergie ( - 20%). Si la /apine est simultanément
gestante, le déficit énergétique devient encare plus grave et
les bilans azotés et minéraux deviennent négatifs eux aussi.
Dans ce cas, la portée de la deuxieme mise bas, en
comparaison avec ce/fe de la premiere, montre un nombre
inférieur de nés (- 10 %) et de nés vivants (- 20 %). En plus,
la composition des nouveaux nés montre un contenu en
lipides plus faible, ce gui peut influencer négativement leur
viabilite. Les besoins energétigues et protéiques d'entretien
et f'efficacité d'utilisation de f'energie digestible (ED) et des
protéines digestibles (PO) pour la production de f'énergie et
des protéines du lait sont indiqués. Dans te cas des tapines en bitan négatif, les coefficients d'utitisation de f'énergie et
des protéines du corps de la lapine, utitisés pour la
production de lait, sont eux aussi indiqués.
Les recherches des auteurs ont eu pour objet d'étudier f'effet
de traitements alimentaires sur les performances
reproductives des tapines. En particulier, l'augmentation de
f'ingestion d'ED en utilisant des aliments additionnés de
graisses stimule la production de lait, ce qui favorise les
lapereaux aflaités, mais ne diminue pas le déficit énergétique
des meres. En plus, le nombre de nés vivants a la deuxieme
mise bas est influencé négativement.
La seule "voie alimentaire" ne semble pas capable de
résoudre le probleme de déficit nutritif et d'éviter les effets
indésirables de la simultanéité de la lactation et de la
gestation. 11 faut done intervenir au niveau de f'élevage en
programmant un rythme de reproduction moins intensif, en
réduisant le nombre de lapereaux aflaités et en préparant les
jeunes tapines futures reproductrices des leur sevrage.Parigi-Bini, R.; Xiccatto, G. (1993). RECHERCHES SUR L'INTERACTION ENTRE ALIMENTATION, REPRODUCTION ET LACTATION CHEZ LA LAPINE, UNE REVUE. World Rabbit Science. 1(4). https://doi.org/10.4995/wrs.1993.209SWORD1
Effetto della sostituzione del latte magro con un concentrato proteico di soia e con siero di latte nell'alimentazione del vitello a carne bianca
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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
High-resolution FTIR spectroscopy of vinyl chloride: the n4 fundamentals of the 35Cl and 37Cl isotopomers
No full textFourier transform infrared spectra of vinyl chloride: the n8 fundamentals of CH2=CH35Cl and CH2=CH37Cl
No full textHigh-resolution FTIR spectroscopy of vinyl chloride in the region of the fundamental bands n10 and n11
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