The aim of this study was to evaluate the effect of the supplementation of fibrous concentrate in the diet on the reproductive performance of alpacas in traditional breeding in the dry Puna of the Peruvian Andes at 4090 m of altitude to increase the fertility and birth rate, weight and body condition of the mothers, and weight at birth. In total, 60 females from first to third parity, with similar weights (37.8 ± 1.2 kg) and body condition (2.31 ± 0.42) were distributed into a supplemented group and a group without supplementation. The fibrous concentrate was prepared with ground hay (12 mmø) of oats and alfalfa, barley bran, soybean meal, vitamin and mineral mix, common salt and molasses (ME 2.48 kcal/g and CP 12%). The supply of the concentrate started 10 days before calving, at a rate of 200 g/day/animal, continuing during calving, mating, gestation, until the next calving. The mat...

The objective of this study was to determine the enteric methane (CH4) emission factor (EF) at the national level for Peruvian dairy cattle following the IPCC Tier II (2006, 2019) methodology. Data were collected from seven regions of Peru and classified according to the type of feeding as intensive, semi-intensive or extensive. It included farm information (geolocation) and livestock information for two seasons of the year. At the national level, lactating cows obtained the highest EF with 117 kg CH4/head/year, followed by heifers from 15 to 24 months of age (91 kg), non-lactating cows (74 kg), heifers from 12 to 15 months of age (67 kg), calves (62 kg) and pre-weaned calves (16 kg). Additionally, the highest EF was reported for lactating cows in the intensive system (151.8 kg CH4/head), which is 46.8 kg CH4/head more per year than that reported in the semi-intensive and extensive syste...