Open AccessRendimiento de leche derivado de energía y proteína de vacas en pastoreo recibiendo suplementos en un sistema agrosilvopastoril
Author(s) -
Sherezada Esparza Jiménez,
Benito Albarrán Portillo,
Manuel González-Ronquillo,
Anastacio García-Martínez,
José Fernando Vázquez-Armijo,
Carlos Manuel Arriaga-Jordán
Publication year - 2021
Publication title -
revista mexicana de ciencias pecuarias
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.206
H-Index - 11
eISSN - 2448-6698
pISSN - 2007-1124
DOI - 10.22319/rmcp.v12i1.5529
Subject(s) - latin square , dry matter , grazing , forage , zoology , milk protein , neutral detergent fiber , biology , food science , rumen , agronomy , fermentation
Dual purpose farms southwest of the State of Mexico produce milk and calves under subtropical agrosilvopastoral systems (ASPS). During the dry season, farmers supplement their cattle due to the low availability and quality of grasses, without considering, besides grasses, the contribution of woody species to dry matter intake, metabolizable energy (ME), and crude protein (CP) requirements of cows. The aim of this study was to determine milk produced from forage energy (MFe) and protein (MFp) of grazing cow with three types of supplement. First supplement consisted of cracked maize and commercial concentrate resulting on 14 % of CP (S14). To the S14 mixture 7 % of soybean meal was added to increase CP to 16 % (S16), and commercial concentrate of 16 % CP was used as a third supplement (SC16). Six lactating cows were allocated in a 3x3 replicated Latin Square (three cows per square), three experimental periods (EP) (three weeks per EP). There were no significant effects of supplements (P=0.80) on performance variables. Mean milk yield was 6.8 kg/cow/d. Milk from forage energy and protein were 0.8 and 6.1 kg/cow/day, respectively. Mean milk urea nitrogen (MUN) was high regardless of supplement; but nitrogen in urine (44.1 mg/dL) and feces (1.4 mg/g) were higher for SC16 (P=0.001 and 0.04, respectively). Cows obtained 90 and 10 % of their CP and metabolizable energy requirements for maintenance and production from the agrosilvopastoral system.