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Lopes FC, de Paiva KAR, Coelho WAC, Nunes FVA, da Silva JB, de Gouveia Mendes da Escóssia Pinheiro C, de Macêdo Praça L, Silva JBA, Alves Freitas CI, Batista JS. Lactation curve and milk quality of goats experimentally infected with Trypanosoma vivax. Exp Parasitol 2016; 167:17-24. [PMID: 27130703 DOI: 10.1016/j.exppara.2016.04.006] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/17/2015] [Revised: 04/03/2016] [Accepted: 04/05/2016] [Indexed: 11/17/2022]
Abstract
The present study aimed to evaluate the effects of Trypanosoma vivax infection on the shape of the lactation curve and the milk quality of dairy goats experimentally infected with T. vivax. In total, twenty Saanen goats, aged 26-30 months and the same number of calving (two calvings), were divided into two experimental groups: an infected group, consisting of ten goats intravenously infected with 0.5 ml of blood containing approximately 1.25 × 10(5) trypomastigotes of T. vivax and ten uninfected animals as the control group. Clinical tests and hematocrit, parasitemia, and serum biochemistry evaluations were performed on all of the goats. Milk production was measured daily for 152 days by hand milking the goats and weighing the milk. Every seven days, physiochemical analyses were performed to evaluate the milk. Wood's nonlinear model was used to analyze the lactation curve parameters. The infected goats had high levels of parasitemia and hyperthermia, significantly reduced hematocrit, serum total protein, albumin, and glucose levels and increased cholesterol and urea concentrations. Wood's model indicated that the milk production of goats in the infected group declined sharply over a short period of time and produced a flattened yield curve and significant difference (P < 0.05) in the rate of increase of peak milk production, rate of decrease of milk production after the peak, day of peak milk production, and maximum peak milk production compared with that of the control group. Trypanosomiasis also affected the persistency of lactation, which was significantly reduced in goats in the infected group. In addition, the physico-chemical properties of the milk, including the fat content, defatted dry extracts (DDE) and protein content, decreased significantly (P < 0.05) in the goats in the infected group compared with those in the control group. The T. vivax-infected goats showed reduction in milk production, persistence of lactation, and fat levels, the defatted dry extract (DDE) content, and protein, changing the quality of milk.
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Affiliation(s)
- Francisco Canindé Lopes
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Kaliane Alessandra Rodrigues de Paiva
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Wesley Adson Costa Coelho
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Francisco Vítor Aires Nunes
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Jardel Bezerra da Silva
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | | | - Layanne de Macêdo Praça
- Department of Zootecnia, Federal University of the Piauí, Campus Professora Cinobelina Elvas, Br 135 Km 03, Planalto Horizonte, 64900-000, Bom Jesus, PI, Brazil.
| | - Jean Berg Alves Silva
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Carlos Iberê Alves Freitas
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
| | - Jael Soares Batista
- Department of Animal Sciences, Federal Rural University of the Semiarid, Av. Francisco Mota, Br 110, Km 47, Costa e Silva, 5959625-900, Mossoró, RN, Brazil.
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