Publications by authors named "Alvaro Aldaz"
Detection of PCV2d in Vaccinated Pigs in Colombia and Prediction of Vaccine T Cell Epitope Coverage against Circulating Strains Using EpiCC Analysis.
Vaccines (Basel)
September 2024
Article Synopsis
- Porcine circovirus type 2 (PCV2) is associated with porcine-circovirus-associated diseases (PCVADs), and while vaccination helps control these diseases, it does not provide complete immunity and may lead to vaccine failure.
- A study conducted in Colombia found that 82% of pigs and 92.9% of herds were infected with PCV2, with the PCV2d variant being the most prevalent.
- Histopathological examinations revealed common lung issues, and the study suggested that bivalent vaccines offer better immune coverage compared to monovalent vaccines despite ongoing clinical cases of PCV2.
Article Synopsis
- - The administration of a GnRF analog in gilts leads to the production of antibodies that effectively suppress ovarian activity and delay sexual maturation, preventing them from reaching puberty before harvest at 27 weeks of age.
- - In three studies, vaccinated gilts showed significantly smaller reproductive organs and lower levels of progesterone and estradiol compared to untreated gilts, with antibody levels remaining elevated following vaccination.
- - These findings suggest that vaccination protocols can be tailored to fit different pig management practices, offering veterinarians and producers flexible options to control the puberty timing in gilts.
The objective was to determine the effects of dietary net energy () during the grow-finish period on live performance and carcass characteristics of intact male pigs managed with immunological castration (Improvest) compared with physically castrated () male pigs. The 101-d study began when 1,008 pigs (504 intact male pigs and 504 PC male pigs; 10 wk old) were allocated by weight to 48 pens with 21 intact males or 21 PC males per pen. Three dietary NE treatments were fed to pigs using five dietary phases (dietary programs were formulated according to standardized ileal digestible lysine requirements of Improvest males or PC males) to provide an average of 2,212 kcal/kg (low NE), 2,337 kcal/kg (medium NE), or 2,462 kcal/kg (high NE).
View Article and Find Full Text PDFThe objective was to determine the effects of net energy (NE) during the grow-finish period on live performance and carcass characteristics of market gilts managed with immunological suppression of ovarian function and estrus (Improvest; IMP) compared with market gilts not managed with Improvest (CON). The 104-d study began when 1,008 gilts (11 wk old; average starting weight of 30.8 kg) were allocated by weight to 48 pens with 21 gilts/pen.
View Article and Find Full Text PDFThis study had 2 objectives: 1) to determine the involvement of Mycoplasma hyopneumoniae in respiratory outbreaks in herds of pigs, with the use of a nested polymerase chain reaction (nPCR) and an enzyme-linked immunosorbent assay (ELISA); and 2) to determine if the dynamics of M. hyopneumoniae infection differ between 3-site versus 1- or 2-site production systems (in which at least farrowing/gestation and nursery pigs are on the same site). Animals of different ages from 12 Spanish farms with respiratory problems were randomly sampled.
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