Revista Colombiana de Ciencias Pecuarias 2024-04-02T00:00:00-05:00 Editor-in-chief: Jorge Agudelo, PhD Open Journal Systems <p><strong> </strong></p> <ul> <li class="show"><strong>ISSN electrónico: </strong>2256-2958</li> <li class="show"><strong>Periodicidad:</strong> Trimestral</li> <li class="show"><strong>Creative Commons:</strong> <a href="" target="_blank" rel="noopener">by-nc-sa</a></li> </ul> Leg health and growth performance of broiler chickens fed grape seed extract 2023-09-08T16:27:54-05:00 Leodan T Rodríguez-Ortega Alejandro Rodríguez-Ortega Arturo Pro-Martínez Eliseo Sosa-Montes Filogonio J Hernández-Guzmán Hector Leyva-Jimenez <p style="font-weight: 400;"><strong>Background: </strong>Active bone remodeling processes can be altered by the presence of reactive oxygen species and, therefore, cause leg problems in broiler chickens. The antioxidant activity present in grape seed extract (GSE) could be a viable alternative to high inclusion levels of vitamin E (VE) as a nutritional strategy to improve the antioxidant capacity of birds and, thus, prevent leg abnormalities. <strong>Objective: </strong>To evaluate the effect of partial substitution of VE with grape GSE on leg health and performance of broiler chickens. <strong>Methods: </strong>Four hundred and twenty newly-hatched Ross 308 male broiler chickens were distributed into three treatments: 1) Control-AL, a diet containing 40 IU/kg of VE and fed <em>ad libitum </em>(CAL); 2) Control-FR, the CAL diet but offered through a feed restriction program (CFR); and 3) grape seed extract-AL, a diet containing 10 mg/kg of GSE + 10 IU/kg of VE fed <em>ad libitum </em>(GSE-AL). The trial was conducted for 47 days. Feed intake and body weight of the chickens were recorded weekly to evaluate performance. At day 43, gait score (GS), valgus/varus angulation (AngV), foot burn (FB), and hock burn (HB) lesions were evaluated. At day 47, tibia-breaking strength (TBS) and gastrocnemius tendon-breaking strength (GTBS) were evaluated. <strong>Results: </strong>Birds in the GSE-AL treatment showed reduced (p≤0.05) GS compared to the other treatments. No statistical differences (p&gt;0.05) were found in AngV, HB, FB, TBS, TGBS, and growth performance among treatments. <strong>Conclusions: </strong>These results suggest that GSE may partially replace VE in broiler diets without negative effects on growth performance or leg health. Further research is required to evaluate the potential of grape seed extract to replace VE or other ingredients with antioxidant activity under different rearing conditions and feeding programs.</p> 2023-09-08T00:00:00-05:00 Copyright (c) 2021 Revista Colombiana de Ciencias Pecuarias Effects of non-genetic factors on milk yield and chemical composition of milk from Holstein-Friesian cows 2023-09-25T16:55:17-05:00 Onur Şahin <p style="font-weight: 400;"><strong>Background: </strong>It is necessary to determine the extent and direction of environmental factors to accurately assess cow performance in terms of milk yield and milk components. Although many studies have explored environmental factors affecting milk yield, there is not enough information about the effects and direction of environmental factors on milk composition. <strong>Objective: </strong>To determine the effects of non-genetic factors, such as calving season, lactation number, lactation stage, animal age, and herd size on milk yield, chemical composition of raw milk, and Somatic Cell Count (SCC) in Holstein-Friesian cows. <strong>Methods: </strong>Data were obtained from 15,354 raw milk samples of 5,118 Holstein-Friesian cows at 276 dairy farms in Türkiye. The data analysis was performed using the General Linear Model (GLM) feature of the SPSS statistics program. <strong>Results: </strong>Mean fat (F), protein (P), dry matter (DM), lactose (L), urea (U), and Log10SCC values of milk were 3.74 ± 0.01, 3.19 ± 0.01, 11.36 ± 0.03, 4.32 ± 0.01%, 21.57 ± 0.28 mg/dL, and 5.244 ± 0.01 cells/mL, respectively. Peak milk yield (PMY), lactation milk yield (LMY), 305-day milk yield (305-d MY), and SCC values were 33.7 ± 0.13, 8,538.33 ± 89.64 kg, 6,479.42 ± 168.96 kg, and 224,164.34 ± 4,402.79 cells/mL, respectively. <strong>Conclusion: </strong>Dairy farms in Türkiye should improve protein, dry matter, and urea contents in milk and investigate in detail the relationship between raw milk urea, subclinical mastitis, and reproductive features.</p> 2023-09-25T00:00:00-05:00 Copyright (c) 2021 Revista Colombiana de Ciencias Pecuarias Physicochemical characterization of milk of 5/8 Holstein x 3/8 Zebu crossbred cows in the tropical region of Mexico 2023-10-12T11:05:37-05:00 Guadalupe Domínguez-Peregrino Roberto González-Garduño Diego Otoniel Ortiz-Pérez <p style="font-weight: 400;"><strong>Background: </strong>Milk price depends on the concentration of milk components, which are influenced by several factors. <strong>Objective: </strong>To determine the effect of cow intrinsic variables on the physicochemical composition of raw milk in a dual-purpose production system. <strong>Methods: </strong>Twenty-five 5/8 Holstein-Friesian × 3/8 Zebu (5/8H3/8Z) lactating cows aged 5-10 years and 1-6 births were selected. Body condition score (BCS) and milk production were recorded. Milk samples were taken throughout lactation from each cow at mid-milking every eight days. Milk composition analysis was carried out using an automatic Lacticheck equipment. <strong>Results: </strong>Average daily milk production per cow was 4.10 L, with 1.03 g/cm3 density, 32.70 g/L fat, 34.50 g/L protein, 50.20 g/L lactose, 91.30 g/L non-fat solids, and 127.00 g/L total solids. The BCS influenced milk composition (p&lt;0.01). Cows with higher BCS (&gt;3.25) showed greater density, protein and lactose, while BCS between 2.00 to 2.50 positively affected fat content (39.20 g/L). Elder cows had increased milk production. In early lactation, milk production was the highest with less fat percentage. <strong>Conclusion: </strong>Although cow production per day is low, milk composition from 5/8H3/8Z cows complies with the standards established in the Mexican norm and is considered to be of good quality.</p> 2023-10-12T00:00:00-05:00 Copyright (c) 2021 Revista Colombiana de Ciencias Pecuarias Efficacy of anthelmintic drugs to control Fasciola hepatica in dairy cattle in Peru 2023-09-18T11:30:33-05:00 Juan Rojas-Moncada Luz Saldaña Víctor Urteaga Roxana Vergara Anthony Rojas Severino Torrel César Murga-Moreno Luis Vargas-Rocha <p style="font-weight: 400;"><strong>Background: </strong>Decreasing antiparasitic efficacy of triclabendazole for controlling <em>Fasciola hepatica </em>in dairy cows in the Cajamarca Valley (Peru) has been reported. <strong>Objective: </strong>To determine the efficacy of four anthelmintic agents across a broader area of Cajamarca province. <strong>Methods: </strong>Four livestock farms were selected from three provinces in the Cajamarca region. Within each farm, 60 female cattle naturally infected with <em>F. hepatica </em>were chosen. Each farm was divided into four homogeneous groups based on individual animals and parasite burden. The groups were: triclabendazole (12 mg/kg of BW, VO), clorsulon/ivermectin (2 mg/kg and 0.2 mg/kg of BW, SC, respectively), closantel (10 mg/kg of BW, VO), and nitroxynil (10 mg/kg of BW, SC). Efficacy was determined following WAAVP guidelines by measuring the reduction in trematode egg shedding on day 30 post-dosing. <strong>Results: </strong>Triclabendazole demonstrated insufficient activity through FERCT and CPCR assessments across all four farms. The clorsulon/ivermectin and closantel groups exhibited high efficacy in all farms, while nitroxynil showed varying efficacy results in both types of analysis. <strong>Conclusions: </strong>Triclabendazole exhibited insufficient activity against <em>F. hepatica</em>. Clorsulon/ivermectin, closantel, and nitroxynil are viable alternatives with promising outcomes for controlling this trematode in the evaluated provinces.</p> 2023-09-18T00:00:00-05:00 Copyright (c) 2021 Revista Colombiana de Ciencias Pecuarias Relationship between number of adult rumen fluke (Calicophoron microbothrioides) and eggs per gram of feces in culled dairy cattle in Peru: A pilot study 2023-10-23T08:40:41-05:00 José F Coronado Teófilo Torrel-Pajares Luis Vargas-Rocha 2023-10-23T00:00:00-05:00 Copyright (c) 2021 Revista Colombiana de Ciencias Pecuarias