Abstract

FLORES M., Marina; ORTEGA B., Rosario E.; BLANCO E., María del Pilar  and  ARANIBAR, Marcelino J.. Productive response of rainbow trout ( Oncorhynchus mykiss ) to the feeding regime with commercial feeds under intensive farming conditions in Lake Titicaca. Rev. investig. vet. Perú [online]. 2023, vol.34, n.2, e25131.  Epub Apr 28, 2023. ISSN 1609-9117.  http://dx.doi.org/10.15381/rivep.v34i2.25131.

The aim of this study was to determine the effect of two feeding regimes (7 vs 6 d) and three commercial foods (TO= Tomasino(r), NA= Naltech(r) and SA= Salmofood(r)) on the productive-commercial performance and organ development of rainbow trout in the fattening phase under conditions of Lake Titicaca, Peru. A total of 1080 trout of 185 g live weight (LW), 26.5 cm total length (TL) and 1.00 body condition index (BCI) were randomly placed in 36 1.2x1.2x1.6 m nylon cages (30 trout/cage). The control of productive parameters (LW, TL and feed consumption) was carried out at 30, 60 and 90 d. The BCI, the mean daily feed intake (DFI), the mean daily weight gain (DWG) and the feed conversion ratio (FCR) were determined. The carcass yield (CY), fillet yield (FY), pigmentation (MP) and the relative weight of the organs were determined at 215 d. The feeding regime did not affect the LW, TL and BCI, but the 7-d feeding had a better FCR (1.12 vs 1.25; p<0.001). Feeding with TO and NA produced lower DFI (3.7, 4.0 and 4.3 g/d; p<0.001), lower DWG (2.9, 3.3 and 4.1 g/d; p<0.001) and worse FCR (1.27, 1.21 and 1.07; p<0.001) with respect to SA at 90 d, respectively. The CY, FY and MP were not affected, but the relative weights of the liver and heart were influenced by feed. It is concluded that the 7-d diet improved feed conversion and pigmentation, while commercial feeds influenced productive performance, pigmentation and relative weight of organs, but not carcass and fillet yield of trout.

Keywords : feeding regimen; commercial feeds; trout; productive performance.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )