Respostas fisiológicas de cabras leiteiras submetidas ao regime de suplementação com concentrado em dois sistemas de produção

Abstract

Physiological variables and heat production were analyzed, from September (1997) to June (1998), estimative of 30 cross breed Saanen dairy goats which were submitted to two production systems, pasture (S1) and semi-confined (S2) and two different diets: 30% of dairy requirements in net energy supplied by concentrate during all lactation (D1) and 60% of requirements from the third to the 13th week of lactation and 15% from the 14th until the end of lactation (D2). The afternoon rectal temperature (RTa), the morning and the afternoon respiratory rate (RRm and RRa) were influenced by the production system. The morning rectal temperature (RTm) was influenced by initial production (IP) and by the morning globe temperature (GTm); the RTa was influenced by the lactation sequence (LS) by the afternoon black-globe temperature (GTa), morning and afternoon air velocity (AVm and AVa), and morning relative humidity (RHm). The RRm was influenced by monthly weight (MW), GTa, AVa, morning dry-bulb temperature (DBTm) and afternoon relative humidity (RHa). The RRa was influenced by GTa, afternoon dry-bulb temperature (DBTa) and RHa. The RRm and RRa was influenced by night heat production (NHP); the RTa and RRa were influenced by dawn heat production (DHP), the RRm and RRa were influenced by the morning heat production (MHP) and the RRm, RRa, RTm and RTa were influenced by the afternoon heat production (AHP).