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Introduction: Creole pig breeds are considered a genetic resource that present rusticity, adaptation to outdoor conditions and good performance in grazing, characteristics of interest for the development of sustainable production systems in the context of family and community peasant economy. This situation requires knowing its growth to identify parameters of zootechnical interest. Objective: Characterize growth in San Pedreño Creole pigs. Methods: 26 animals (14 females and 12 males) belonging to the Pig Animal Germplasm Bank of the El Nus Research Center of AGROSAVIA were used. For each GENÉTICA Y MEJORAMIENTO animal, weight (kg) and age (months) were recorded; animals with at least 4 weight records were taken into account for the analysis. The animals were fed on pasture, accompanied by a balanced supplement and sugar cane. A health plan was applied in a preventive scheme for outdoor pig production. Brody's mathematical model was used to describe growth, using the NLIN procedure of the SAS statistical package. Results and Discussion: For males, the model estimated the parameter β0 (asymptotic weight) at 140.6±9.7, the β1 (integration constant) at 1.125±0.039 and the β2 (growth rate) at 0.112±0.015. On the contrary, for females a value of 115.7±5.28, 1.25±0.057 and 0.158±0.016 was found, for b0, β1 and β2 respectively. Based on these parameters, it was estimated that males reach 75% of their maturity at 5.8 months and 95% at 12 months of age. In the case of females, 75% of their maturity was reached at 4.4 months and 95% at 8.8 months. The results showed a sexual dimorphism with greater weight for males. However, it was observed that females grow earlier, which indicates that they will reach adult weight more quickly. Conclusion: The Brody model described the growth of San Pedreño pigs under the conservation core, identifying parameters of interest that allow managing the growth of animals in production systems. [ABSTRACT FROM AUTHOR]

Introduction: The backyard poultry farming contributes to the development of rural communities by preserving species, culture, and tradition, thus promoting food security. The sustainability of these systems is contingent upon overcoming productivity issues associated with traditional management practices. However, the characterization of nutritional management remains limited, constraining opportunities for improvement. Objective: To characterize the nutritional management of backyard poultry in three rural areas of the Antioquia department. Methods: Thirty backyard poultry farms in rural areas of San Roque (17), Maceo (7), and Caracolí (6) municipalities were characterized. Data were collected through a systematic survey including bird species, number of birds, feeding frequency, and types of feed. Data were compared between municipalities using the Kruskal-Wallis test and presented as median ± interquartile range. Thus, the frequencies of feed types are presented as the percentage of occurrence in the total identified feeds. Results and Discussion: Caracolí had the highest number of backyard birds per farm (44±24), compared to Maceo (24±13) and San Roque (16±21) (P=0.02). San Roque had a higher number of hens per farm (14±14; P=0.02). The fattening of chickens showed a similar number of birds per farm in all three municipalities (9±9; P=0.23). These systems had a similar number (P=0.19) of other livestock (7±5.5) and similar feeding frequency (1.5±1 times/day; P=0.32). Three farms provided ad libitum feeding, while the remaining offered 88.9±60 g/bird/day of feed (P=0.84). The types of feed identified were whole corn (54.1%), concentrates (21.3%), mixtures of concentrates + by-products (10.45%), corn meal (6.55%), forages (2.27%), cooked kitchen residues (1.63%), and cheese whey (1.63%). Conclusion: The variety of identified feeds reflects producers' adaptation to locally available resources. However, ad libitum feeding in some characterized farms may influence the sustainability of these systems. Acknowledgments: Ministry of Agriculture and Rural Development - MADR and the Colombian Agricultural Research Corporation - Agrosavia for their technical and financial support through the project: MADR Agreement 334-2023. [ABSTRACT FROM AUTHOR]

Antecedentes: tradicionalmente, los corderos se amamantan de manera continua, con destete abrupto. Esto provoca estrés, con disminución del crecimiento e inmunosupresión. Objetivo: evaluar el comportamiento y crecimiento durante la lactancia y postdestete en ovinos de pelo colombiano en dos tipos de lactancia. Métodos: se utilizaron 70 ovejas y sus crías, que se asignaron en uno de dos tratamientos. Amamantamiento continuo (AC): los corderos pasaron todo el día con su madre, saliendo a pastorear entre las 7:00 y las 16:00 horas y luego alojados en un aprisco convencional en la noche (n = 35). Amamantamiento restringido (AR): los corderos y sus madres pastorearon en potreros diferentes entre las 7:00 y las 16:00 horas (n = 35) y se encontraron en un aprisco convencional en la noche. Los corderos se pesaron al nacimiento y cada 30 días hasta los 210 días. El destete fue al día 90. Se midieron 13 comportamientos, 10 minutos al inicio de cada hora, entre las 7:00 y las 18:00 horas, cada 30 días. Los datos fueron analizados bajo un modelo lineal con los efectos fijos tipo de lactancia y edad. Resultados: los comportamientos variaron (p < 0,05) por efecto de tratamiento, edad y su interacción. En particular, los corderos en AR pasaron más tiempo antes del destete balando y caminando, pero solo hasta los 60 días. Desde esta edad los corderos en AC dedicaron más tiempo a estos comportamientos. El tiempo de amamantamiento fue mayor en AC. Después del destete los corderos en AR dedicaron más tiempo a comer y beber. Al nacimiento y a los 30 días los pesos no variaron (p > 0,05). Luego las diferencias (p < 0,01) entre pesos, fueron mayores en los corderos en AR por efecto de tratamiento, edad y su interacción. Las ganancias de peso predestete en AC y AR fueron 70,4 ± 12,4 y 87,5 ± 20,2, respectivamente, y de 100,9 ± 10,4 y 139,0 ± 12,3 en postdestete (p < 0,05). Conclusiones: los comportamientos compatibles con estrés fueron evidentes en los corderos en AR al inicio de la lactancia, estos disminuyeron con la edad. En los animales en AC, esto se dio a partir del destete. Esta interacción se evidenció en las ganancias de pesos y los pesos ajustados, con mejor desempeño de los corderos en AR. [ABSTRACT FROM AUTHOR]

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Copyright of Revista Colombiana de Ciencias Pecuarias is the property of Universidad de Antioquia and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)